diff --git a/colossalai/inference/config.py b/colossalai/inference/config.py
index ea06335b7..1c159f203 100644
--- a/colossalai/inference/config.py
+++ b/colossalai/inference/config.py
@@ -3,7 +3,7 @@ from dataclasses import dataclass
 from typing import Optional, Union
 
 import torch
-import torch.nn as nn
+import torch.distributed as dist
 
 GibiByte = 1024**3
 
@@ -15,44 +15,44 @@ class InferenceConfig:
     """The inference configuration.
 
     Args:
-        model: Path or nn.Module of this model.
-        tokenizer: Path of the tokenizer to use.
-        tokenizer_mode: "auto" will use the fast tokenizer if available, and "slow" will always use the slow tokenizer.
-        trust_remote_code: Whether to trust remote code from huggingface.
-        max_batch_size: Maximum batch size.
-        max_output_len: Maximum output length.
-        max_input_len: Maximum input length.
-        block_size: The number of blocks in a logical block.
-        dtype: The data type for weights and activations.
-        tp_size: Tensor parallel size.
-        pp_size: Pipeline parallel size.
-        max_seq_len: Maximum length of input sentence.
-        quant_mode: Quantization mode.
-        revision: The specific version(a branch, name, a commit id, or a tag name) of model to use.
-        beam_width: The maximum beam width used to initialize KV Cache.
+        micro_batch_size (int): the micro batch size. Only useful when `pp_size` > 1.
+        micro_batch_buffer_size (int): the buffer size for micro batch. Normally, it should be the same as the number of pipeline stages.
+        max_batch_size (int): Maximum batch size.
+        max_output_len (int): Maximum output length.
+        max_input_len (int): Maximum input length.
+        block_size (int): The number of blocks in a logical block.
+        dtype (Union[str, torch.dtype]): The data type for weights and activations.
+        tp_size (int): Tensor parallel size.
+        pp_size (int): Pipeline parallel size.
+        max_seq_len (int): Maximum length of input sentence.
+        beam_width (int): The maximum beam width used to initialize KV Cache.
             During generation, the beam width provided as sampling parameter should be less than or equivalent to this value.
-        prefill_ratio: A controling ratio for prefill and decoding in running list, we will do a step of prefill
+        prefill_ratio (Optional[float]): A controling ratio for prefill and decoding in running list, we will do a step of prefill
             when the actual value exceeds this ratio.
+        quant_mode (Optional[str]): Quantization mode.
+        revision (Optional[str]): The specific version(a branch, name, a commit id, or a tag name) of model to use.
     """
 
-    model: Union[str, nn.Module]
-    tokenizer: str = None
-    tokenizer_mode: str = "auto"
-    trust_remote_code: bool = False
-    max_batch_size: int = None
+    micro_batch_size: int = 1
+    micro_batch_buffer_size: int = None
+    max_batch_size: int = 8
     max_output_len: int = 256
     max_input_len: int = 256
     block_size: int = 16
     dtype: Union[str, torch.dtype] = torch.float32
     tp_size: int = 1
     pp_size: int = 1
-    max_seq_len: Optional[int] = None
-    quant_mode: Optional[str] = None
-    revision: Optional[str] = None
-    beam_width: int = 1
+    max_seq_len: int = 512
     # TODO: beam search is not support for now
-    prefill_ratio: Optional[float] = 1.2
+    beam_width: int = 1
     # the ratio of prefill sequences to decoding sequences, we do prefill step once the actual value exceeds ratio
+    prefill_ratio: Optional[float] = 1.2
+    quant_mode: Optional[str] = None
+    revision: Optional[str] = None
+
+    def __post_init__(self):
+        self._init_batch_size()
+        self._verify_config()
 
     def _init_batch_size(self):
         """
@@ -75,10 +75,20 @@ class InferenceConfig:
             f"The maximum batch size is automatically set to {self.max_batch_size} as no value is provided by the user."
         )
 
-    def __post_init__(self):
-        self._init_batch_size()
-        self._verify_args()
-
-    def _verify_args(self):
-        if self.tokenizer_mode not in ["auto", "slow"]:
-            raise ValueError("Tokenizer mode must be " "either 'auto' or 'slow'," f"but got {self.tokenizer_mode}")
+    def _verify_config(self) -> None:
+        """
+        Verify the input config
+        """
+        assert (
+            self.tp_size * self.pp_size == dist.get_world_size()
+        ), f"TP size({self.tp_size}) * PP size({self.pp_size}) should be equal to the global world size ({dist.get_world_size()})"
+        assert self.dtype in [
+            "fp16",
+            "fp32",
+            "bf16",
+            torch.float32,
+            torch.float16,
+            torch.bfloat16,
+        ], "dtype should be one of 'fp16', 'fp32', 'bf16', torch.float32, torch.float16, torch.bfloat16"
+        assert self.max_batch_size <= 64, "Max batch size exceeds the constraint"
+        assert self.quant_mode in ["smoothquant", "gptq", None], "quant should be one of 'smoothquant', 'gptq'"
diff --git a/colossalai/inference/core/engine.py b/colossalai/inference/core/engine.py
index 232bfb188..3aad5ad97 100644
--- a/colossalai/inference/core/engine.py
+++ b/colossalai/inference/core/engine.py
@@ -1,65 +1,232 @@
-from logging import Logger
-from typing import Optional
+from itertools import count
+from typing import List, Optional, Union
 
-from transformers import AutoConfig
+import torch
+import torch.nn as nn
+from transformers import GenerationConfig, PreTrainedTokenizer, PreTrainedTokenizerFast
 
+from colossalai.cluster import ProcessGroupMesh
 from colossalai.inference.config import InferenceConfig
+from colossalai.inference.modeling.policy import model_policy_map
+from colossalai.inference.struct import Sequence
+from colossalai.logging import get_dist_logger
+from colossalai.pipeline.stage_manager import PipelineStageManager
+from colossalai.shardformer import ShardConfig, ShardFormer
+from colossalai.shardformer.policies.base_policy import Policy
+
+from .request_handler import RequestHandler
+
+PP_AXIS, TP_AXIS = 0, 1
+
+_supported_models = [
+    "LlamaForCausalLM",
+]
 
 
 class InferenceEngine:
-    """
-    InferenceEngine is the core component for Inference.
 
-    It is responsible for launch the inference process, including:
-        - Initialize model and distributed training environment(if needed)
-        - Launch request_handler and corresponding kv cache manager
-        - Receive requests and generate texts.
-        - Log the generation process
+    """
+    InferenceEngine which manages the inference process..
 
     Args:
-        tokenizer: Path of the tokenizer to use.
-        inference_config: We provide a unified config api for that wrapped all the configs. You can use it to replace the below configs.
+        model (nn.Module): Path or nn.Module of this model.
+        tokenizer (Union[PreTrainedTokenizer, PreTrainedTokenizerFast]): Path of the tokenizer to use.
+        inference_config (Optional[InferenceConfig], optional): Store the configuration information related to inference.
         verbose (bool): Determine whether or not to log the generation process.
+        model_policy ("Policy"): the policy to shardformer model. It will be determined by the model type if not provided.
     """
 
     def __init__(
         self,
-        tokenizer: str = None,
+        model: nn.Module,
+        tokenizer: Union[PreTrainedTokenizer, PreTrainedTokenizerFast],
         inference_config: Optional["InferenceConfig"] = None,
         verbose: bool = False,
+        model_policy: Policy = None,
     ) -> None:
         assert inference_config, "Please provide inference_config."
-
-        self._init_model()
-        # cache_config may need to be modified later.
-        # self.request_handler = RequestHandler(cache_config)
         self.tokenizer = tokenizer
-        self.hf_model_config = AutoConfig.from_pretrained(
-            self.model, trust_remote_code=self.trust_remote_code, revision=self.revision
+        self.inference_config = inference_config
+        self.model_config = model.config
+
+        if inference_config.dtype == "fp32" or inference_config.dtype == torch.float32:
+            self.dtype = torch.float32
+        elif inference_config.dtype == "fp16" or inference_config.dtype == torch.float16:
+            self.dtype = torch.float16
+            model.half()
+        else:
+            self.dtype = torch.bfloat16
+            model.to(torch.bfloat16)
+
+        if model_policy is None:
+            model_policy = model_policy_map[self.model_config.model_type]()
+
+        pg_mesh = ProcessGroupMesh(inference_config.pp_size, inference_config.tp_size)
+
+        self.model = self._shardformer(
+            model,
+            model_policy,
+            None,
+            pg_mesh.get_group_along_axis(TP_AXIS) if inference_config.pp_size * inference_config.tp_size > 1 else None,
         )
+
+        self.verbose = verbose
         if verbose:
-            self.logger = Logger()
+            self.logger = get_dist_logger(__name__)
+
+        self.request_handler = RequestHandler(self.inference_config, self.model_config)
+        self.counter = count()
+
+    def _verify_config(self) -> None:
+        """
+        Verify the input config
+        """
+        if not isinstance(self.model, nn.Module):
+            raise TypeError(f"the model type must be nn.Module, but get {type(self.model)}")
+        if not isinstance(self.tokenizer, PreTrainedTokenizerFast) and not isinstance(
+            self.tokenizer, PreTrainedTokenizer
+        ):
+            raise TypeError(
+                f"the tokenizer type must be PreTrainedTokenizer or PreTrainedTokenizerFast, but get {type(self.tokenizer)}"
+            )
+        assert (
+            self.model.__class__.__name__ in _supported_models
+        ), f"Model {self.model.__class__.__name__} is not supported."
+
+    def _shardformer(
+        self,
+        model: nn.Module,
+        model_policy: Policy,
+        stage_manager: PipelineStageManager = None,
+        tp_group: ProcessGroupMesh = None,
+    ) -> nn.Module:
+        """
+        Initialize ShardConfig and replace the model with shardformer.
+
+        Args:
+            model (nn.Module): Path or nn.Module of this model.
+            model_policy (Policy): The policy to shardformer model which is determined by the model type.
+            stage_manager (PipelineStageManager, optional): Used to manage pipeline stages. Defaults to None.
+            tp_group (ProcessGroupMesh, optional): Used to manage the process TP group mesh. Defaults to None.
+
+        Returns:
+            nn.Module: _description_
+        """
+        shardconfig = ShardConfig(
+            tensor_parallel_process_group=tp_group,
+            pipeline_stage_manager=stage_manager,
+            enable_tensor_parallelism=(self.inference_config.tp_size > 1),
+            enable_fused_normalization=False,
+            enable_all_optimization=False,
+            enable_flash_attention=False,
+            enable_jit_fused=False,
+            enable_sequence_parallelism=False,
+            extra_kwargs={"quant": self.inference_config.quant_mode},
+        )
+        shardformer = ShardFormer(shard_config=shardconfig)
+        shard_model, _ = shardformer.optimize(model, model_policy)
+        return shard_model.cuda()
 
-    def _init_model(self):
+    def generate(
+        self,
+        generation_config: GenerationConfig = None,
+    ) -> List[str]:
         """
-        Initialize model and distributed training environment(if needed).
-        May need to provide two different initialization methods:
-            1. 用户自定义(from local path)
-            2. 从checkpoint加载(hugging face)
+        Executing the inference step.
+
+        Args:
+            generation_config (GenerationConfig, optional): Huggingface GenerationConfig used for inference. Defaults to None.
+
+        Returns:
+            List[str]: Inference result returned by one generation.
         """
 
-    def _verify_config(self):
+        self.generation_config = generation_config
+
+        output_list = []
+
+        while self.request_handler.check_unfinished_seqs():
+            output_list += self.step()
+
+        return output_list
+
+    def add_request(
+        self,
+        requests_id: List[int] = None,
+        prompts: List[str] = None,
+        prompts_token_ids: List[int] = None,
+    ) -> None:
         """
-        Verify the configuration to avoid potential bugs.
+        Add requests.
+
+        Args:
+            requests_id (List[int], optional): The request ID. Defaults to None.
+            prompts (Union[List[str], optional): Input prompts. Defaults to None.
+            prompts_token_ids (List[List[int]], optional): token ids of input prompts. Defaults to None.
         """
 
-    def generate(self):
-        pass
+        block_size = self.inference_config.block_size
 
-    def step(self):
+        if prompts_token_ids is None:
+            assert prompts, "When the prompts_token_ids is none, the input prompt list must be provided."
+            prompts_token_ids = []
+            for prompt in prompts:
+                prompts_token_ids.append(self.tokenizer.encode(prompt))
+
+        prompts_num = len(prompts_token_ids)
+
+        for i in range(prompts_num):
+            if requests_id:
+                request_id = requests_id[i]
+            else:
+                request_id = next(self.counter)
+            if prompts == None:
+                prompt = None
+            else:
+                prompt = prompts[i]
+            sequence = Sequence(
+                request_id,
+                prompt,
+                prompts_token_ids[i],
+                block_size,
+                None,
+                None,
+                self.tokenizer.eos_token_id,
+                self.inference_config.max_output_len,
+            )
+            self.request_handler.add_sequence(sequence)
+
+    def step(self) -> List[str]:
         """
         In each step, do the follows:
-            1. Run request_handler to update the kv cache and running input_ids
+            1. Run RequestHandler.schedule() and get the batch used for inference.
             2. Run model to generate the next token
-            3. Check whether there is finied request and decode
+            3. Update waiting list and running list in RequestHandler and get finished sequences.
+            4. Decode and return finished sequences.
+
+        Returns:
+            List[str]: Decoded finished sequences generated by one step.
         """
+
+        if self.verbose:
+            self.logger.info("Running generation step")
+
+        output_list = []
+        self.request_handler.schedule()
+
+        # Uncomment if the development of RequestHandler is completed.
+        # logits = self.model(batch)
+        # self.request_handler.search_tokens(logits, self.generation_config)
+
+        finished_sequences = self.request_handler.update()
+
+        # Decode completed sentences.
+        for seq in finished_sequences:
+            if seq.prompt:
+                output_str = self.tokenizer.decode(seq.output_token_id, skip_special_tokens=True)
+                output_list.append(seq.prompt + output_str)
+            else:
+                output_str = self.tokenizer.decode(seq.input_token_id + seq.output_token_id, skip_special_tokens=True)
+                output_list.append(output_str)
+
+        return output_list
diff --git a/colossalai/inference/core/request_handler.py b/colossalai/inference/core/request_handler.py
index e7898879a..bfa26de7c 100644
--- a/colossalai/inference/core/request_handler.py
+++ b/colossalai/inference/core/request_handler.py
@@ -1,5 +1,7 @@
 from typing import List
 
+from colossalai.inference.struct import BatchInfo, Sequence
+
 
 class RequestHandler:
     """
@@ -7,14 +9,17 @@ class RequestHandler:
     During generation process, we call schedule function each iteration to update current batch.
 
     Args:
-        cache_config: Configuration for initialize and manage kv cache.
+        inference_config: Store the configuration information related to inference.
+        model_config: The huggingface model config.
     """
 
-    def __init__(self, cache_config) -> None:
-        self.cache_config = cache_config
+    def __init__(self, inference_config, model_config) -> None:
+        self.inference_config = inference_config
+        self.model_config = model_config
         self._init_cache()
-        self.waiting_list: List["Reqseq"] = []
-        self.running_list: List["Reqseq"] = []
+        self.waiting_list: List["Sequence"] = []
+        self.running_list: List["Sequence"] = []
+        self.batch = BatchInfo.init_batch()
 
     def _init_cache(self):
         """
@@ -25,12 +30,17 @@ class RequestHandler:
         """
         The main logic of request handler.
         """
+        # The code below is only used for testing engine and will be modified.
+        if self.waiting_list:
+            self.running_list = self.waiting_list
+        self.batch.add_seqs(self.running_list)
+        return self.batch
 
-    def add_sequence(self, reqseq: "Reqseq"):
+    def add_sequence(self, req_seq: "Sequence"):
         """
         Add the request to waiting list.
         """
-        self.waiting_list.append(reqseq)
+        self.waiting_list.append(req_seq)
 
     def abort_sequence(self, seq_id: str):
         """
@@ -39,10 +49,23 @@ class RequestHandler:
         self._find_sequence(seq_id)
         return
 
-    def _find_sequence(self, seq_id: str) -> "Reqseq":
+    def _find_sequence(self, seq_id: str) -> "Sequence":
         """
         Find the request by seq_id.
         """
 
     def check_unfinished_seqs(self) -> bool:
-        return self.waiting_list or self.running_list
+        return len(self.waiting_list) != 0 or len(self.running_list) != 0
+
+    def update(self):
+        """
+        Update the waiting list and running list.
+        """
+
+        # The code below is only used for testing engine and will be modified.
+        self.waiting_list = []
+        self.running_list = []
+        finished_sequences = list(self.batch.sequences_set)
+
+        self.batch.clear_batch()
+        return finished_sequences
diff --git a/colossalai/inference/kv_cache/kvcache_manager.py b/colossalai/inference/kv_cache/kvcache_manager.py
index 493613d68..8c3b207e1 100644
--- a/colossalai/inference/kv_cache/kvcache_manager.py
+++ b/colossalai/inference/kv_cache/kvcache_manager.py
@@ -135,7 +135,7 @@ class KVCacheManager:
         and updates the provided block table with the allocated block ids.
 
         Args:
-            block_table: A 1D tensor of shape [max_blocks_per_sequence], storing mapping of token_position_id -> block_id.
+            block_table: A 1D tensor of shape [max_blocks_per_sequence] holded by a sequence, storing mapping of token_position_id -> block_id.
             context_len: The length of the processing sequnece.
         """
         assert block_table.dim() == 1
@@ -185,7 +185,7 @@ class KVCacheManager:
         and updates the provided block table if a new cache block is needed.
 
         Args:
-            block_table: A 1D tensor of shape [max_blocks_per_sequence], storing mapping of token_position_id -> block_id.
+            block_table: A 1D tensor of shape [max_blocks_per_sequence] holded by a sequence, storing mapping of token_position_id -> block_id.
             context_len: The length of the processing sequnece (already-allocated length).
         """
         assert block_table.dim() == 1
@@ -199,7 +199,7 @@ class KVCacheManager:
         and updates the provided block table with the allocated block.
 
         Args:
-            block_table: A 1D tensor of shape [max_blocks_per_sequence], storing mapping of token_position_id -> block_id.
+            block_table: A 1D tensor of shape [max_blocks_per_sequence] holded by a sequence, storing mapping of token_position_id -> block_id.
             block_local_idx: The index of the block in the block table.
             space_asked: i.e. The number of tokens to be assigned space for.
         Returns:
diff --git a/colossalai/inference/modeling/policy/__init__.py b/colossalai/inference/modeling/policy/__init__.py
new file mode 100644
index 000000000..100993941
--- /dev/null
+++ b/colossalai/inference/modeling/policy/__init__.py
@@ -0,0 +1,7 @@
+from .llama import LlamaModelInferPolicy
+
+model_policy_map = {
+    "llama": LlamaModelInferPolicy,
+}
+
+__all__ = ["LlamaModelInferPolicy", "model_polic_map"]
diff --git a/colossalai/inference/modeling/policy/llama.py b/colossalai/inference/modeling/policy/llama.py
new file mode 100644
index 000000000..f747eedef
--- /dev/null
+++ b/colossalai/inference/modeling/policy/llama.py
@@ -0,0 +1,7 @@
+from colossalai.shardformer.policies.llama import LlamaForCausalLMPolicy
+
+
+class LlamaModelInferPolicy(LlamaForCausalLMPolicy):
+    # The code here just for test and will be modified later.
+    def __init__(self) -> None:
+        super().__init__()
diff --git a/colossalai/inference/struct.py b/colossalai/inference/struct.py
index a5201d787..3a9064dcf 100644
--- a/colossalai/inference/struct.py
+++ b/colossalai/inference/struct.py
@@ -1,68 +1,82 @@
 import enum
 from dataclasses import dataclass
-from typing import Dict, List, Set
+from typing import List, Union
+
+import torch
+from ordered_set import OrderedSet
+
+from colossalai.logging import get_dist_logger
+
+logger = get_dist_logger(__name__)
 
 """
 The abstraction of request and sequence are defined here.
 """
 
 
-class RequsetStatus(enum.Enum):
-    """The status of Sentences"""
+class RequestStatus(enum.Enum):
+    """
+    The status of Sentences
+    """
 
+    # running status
     WAITING = enum.auto()
-    RUNNING = enum.auto()
+    PREFILL = enum.auto()
+    TOKEN = enum.auto()
     ABORTED = enum.auto()
+
+    # completion status
     OVERLENGTH = enum.auto()
     COMPLETED = enum.auto()
     LENGTH_CAPPED = enum.auto()
 
     @staticmethod
-    def is_finished(status: "RequsetStatus") -> bool:
+    def is_finished(status: "RequestStatus") -> bool:
         return status in [
-            RequsetStatus.OVERLENGTH,
-            RequsetStatus.COMPLETED,
-            RequsetStatus.LENGTH_CAPPED,
+            RequestStatus.OVERLENGTH,
+            RequestStatus.COMPLETED,
+            RequestStatus.LENGTH_CAPPED,
         ]
 
     @staticmethod
-    def is_running(status: "RequsetStatus") -> bool:
-        return status == RequsetStatus.RUNNING
+    def is_running(status: "RequestStatus") -> bool:
+        return status in [
+            RequestStatus.PREFILL,
+            RequestStatus.TOKEN,
+        ]
 
     @staticmethod
-    def is_waiting(status: "RequsetStatus") -> bool:
-        return status == RequsetStatus.WAITING
+    def is_waiting(status: "RequestStatus") -> bool:
+        return status == RequestStatus.WAITING
 
 
+@dataclass
 class Sequence:
     """Store information of input sequence.
 
     Args:
-        request_id: The ID of input sequence.
-        prompt: The prompt of input sequence.
-        token_id: The tokens ID of input sequence.
-        block_size: The block size of input sequence.
-        sample_params: The sample_params of input sequence.
-        block_table_index: The index of input sequence in block_table.
+        request_id (int): The ID of input sequence.
+        prompt (str): The prompt of input sequence.
+        input_token_id (List[int]): The tokens ID of input sequence.
+        block_size (int): The block size of input sequence.
+        sample_params (SampleParams): The sample_params of input sequence.
+        block_table (torch.Tensor): The index of input sequence in block_table.
+        eos_token_id (int): The eos token id for this inference process.
+        max_output_len (int): Maximum output length.
     """
 
-    def __init__(
-        self,
-        request_id: int,
-        prompt: str,
-        token_id: List[int],
-        block_size: int,
-        sample_params,  # SampleParams needs to be imported later.
-        block_table_index: int,
-    ):
-        self.request_id = request_id
-        self.prompt = prompt
-        self.input_token_id = token_id
-        self.blokc_size = block_size
-        self.sample_params = sample_params
+    request_id: int
+    prompt: str
+    input_token_id: List[int]
+    block_size: int
+    sample_params: any  # SampleParams needs to be imported later.
+    block_table: torch.Tensor
+    eos_token_id: int
+    max_output_len: int = 256
+
+    def __post_init__(self):
         self.output_token_id = []
-        self.status = RequsetStatus.WAITING
-        self.block_table_index = block_table_index
+        self.status = RequestStatus.WAITING
 
     def get_sentence_len(self) -> None:
         """
@@ -84,17 +98,30 @@ class Sequence:
 
     def check_finish(self) -> bool:
         """
-        Check whether inference is over.
+        Check whether the inference is finished.
+
+        Returns:
+            bool: Whether the inference is finished.
         """
-        return RequsetStatus.is_finished(self.status)
+        if RequestStatus.is_finished(self.status):
+            return True
+
+        if self.output_token_id:
+            if self.output_token_id[-1] == self.eos_token_id or len(self.output_token_id) == self.max_output_len:
+                self.status = RequestStatus.COMPLETED
+                return True
+
+        return False
+
+    def __hash__(self):
+        return hash(self.request_id)
 
     def __repr__(self) -> str:
         return (
             f"Request ID(request_id={self.request_id}, "
             f"prompt={self.prompt}, "
             f"status={self.status.name}, "
-            f"sample_params={self.sample_params}, "
-            f"logical block number={len(self._logical_blocks)}"
+            f"sample_params={self.sample_params}"
         )
 
 
@@ -104,34 +131,38 @@ class BatchInfo:
     Information to be passed and used for a batch of sequences.
     """
 
-    sequences_set: Set[Sequence]
-    block_table: Dict[int, int] = None
+    sequences_set: OrderedSet["Sequence"]
 
     @classmethod
-    def init_batch(cls, seqs: List[Sequence]) -> "BatchInfo":
+    def init_batch(cls, seqs: List["Sequence"] = None) -> "BatchInfo":
         """
         Initializes inference batches by input sentence list.
 
         Args:
-            seqs (List[Sequence]): List of input sequence.
+            seqs (List["Sequence"]): List of input sequence.
         """
-        sequences_set = set()
-        block_table = {}
-        for seq in seqs:
-            if seq in sequences_set:
-                assert (
-                    seq.request_id in block_table.keys()
-                ), "The sequence has been added to sequences_set, but it has not been added to block_table."
-                continue
 
-            assert (
-                seq.request_id not in block_table.keys()
-            ), "The sequence has not been added to sequences_set, but it is already in block_table."
+        sequences_set = OrderedSet()
+
+        if seqs is not None:
+            if not isinstance(seqs, list):
+                seqs = [seqs]
+            for seq in seqs:
+                if seq in sequences_set:
+                    logger.warning(f"The sequence(request_id {seq.request_id}) is already in sequences_set.")
+                    continue
 
-            sequences_set.add(seq)
-            block_table[seq.request_id] = seq.block_table_index
+                sequences_set.add(seq)
 
-        return cls(sequences_set=sequences_set, block_table=block_table)
+        return cls(sequences_set=sequences_set)
+
+    def get_block_table_tensor(self):
+        tesnor_list = []
+        for seq in self.sequences_set:
+            block_table = seq.block_table
+            assert block_table, f"The sequence(request_id {seq.request_id}) has not initialized the block_table."
+            tesnor_list.append(seq.block_table)
+        return torch.concat(tesnor_list)
 
     def clear_batch(self) -> None:
         """
@@ -139,35 +170,76 @@ class BatchInfo:
         """
         for seq in self.sequences_set:
             if not seq.check_finish():
-                seq.status = RequsetStatus.ABORTED
+                seq.status = RequestStatus.ABORTED
         self.sequences_set.clear()
-        self.block_table.clear()
 
-    def fliter_batch(self) -> None:
+    def fliter_batch(self) -> List["Sequence"]:
         """
         Remove completed sentences from a batch.
+
+        Returns:
+            List["Sequence"]: List of finished sequences.
         """
-        for seq in self.sequences_set.copy():
+        finish_seqs = []
+        for seq in self.sequences_set:
             if seq.check_finish():
-                self.sequences_set.remove(seq)
-                del self.block_table[seq.request_id]
+                finish_seqs.append(seq)
+        for finish_seq in finish_seqs:
+            self.sequences_set.discard(finish_seq)
+        return finish_seqs
 
-    def add_seqs(self, seqs: List[Sequence]) -> None:
+    def abort_seq(self, seq: "Sequence") -> "Sequence":
+        """
+        Remove sequence from the batch.
+        """
+        if not seq.check_finish():
+            seq.status = RequestStatus.ABORTED
+        self.sequences_set.discard(seq)
+        return seq
+
+    def add_seqs(self, seqs: List["Sequence"]) -> None:
         """
         Add new sequence to batch
 
         Args:
-            seqs (List[Sequence]): The list of new sequences.
+            seqs (List["Sequence"]): The list of new sequences.
         """
+
+        if not isinstance(seqs, list):
+            seqs = [seqs]
+
         for seq in seqs:
             if seq in self.sequences_set:
-                print("The sequence is already in sequences_set.")
-                assert (
-                    seq.request_id in self.block_table
-                ), "The sequence has been added to sequences_set, but it has not been added to block_table."
+                logger.warning(f"The sequence(request_id {seq.request_id}) is already in sequences_set.")
                 continue
-            assert (
-                seq.request_id not in self.block_table
-            ), "The sequence has not been added to sequences_set, but it is already in block_table."
             self.sequences_set.add(seq)
-            self.block_table[seq.request_id] = seq.block_table_index
+
+    def is_empty(self) -> None:
+        """
+        Check whether sequences_set is empty.
+        """
+        return not self.sequences_set
+
+    def update_batch_tokens(self, tokens: Union[List[int], List[List[int]]]) -> None:
+        """
+        Add an output token for each sentence in the batch.
+
+        Args:
+            tokens (List[int]): A batch of tokens
+        """
+
+        assert self.get_batch_size() == len(tokens), "The number of tokens does not match batch_size."
+
+        for seq, token in zip(self.sequences_set, tokens):
+            if not isinstance(token, list):
+                if not isinstance(token, int):
+                    raise TypeError(f"The token type must be List[int] or int, but get {type(token)}.")
+                token = [token]
+            seq.output_token_id += token
+            seq.check_finish()
+
+    def get_batch_size(self) -> int:
+        """
+        Get batch_size of this batch
+        """
+        return len(self.sequences_set)
diff --git a/requirements/requirements-infer.txt b/requirements/requirements-infer.txt
index f85f9d88e..2d85300c3 100644
--- a/requirements/requirements-infer.txt
+++ b/requirements/requirements-infer.txt
@@ -1,4 +1,5 @@
+ordered_set
 transformers==4.34.0
 auto-gptq==0.5.0
 git+https://github.com/ModelTC/lightllm.git@ece7b43f8a6dfa74027adc77c2c176cff28c76c8
-git+https://github.com/Dao-AILab/flash-attention.git@017716451d446e464dde9aca3a3c1ed2209caaa9
+git+https://github.com/Dao-AILab/flash-attention.git@017716451d446e464dde9aca3a3c1ed2209caaa9
\ No newline at end of file
diff --git a/requirements/requirements-test.txt b/requirements/requirements-test.txt
index 4136cefc3..a9d8b2363 100644
--- a/requirements/requirements-test.txt
+++ b/requirements/requirements-test.txt
@@ -1,4 +1,6 @@
 diffusers
+fbgemm-gpu==0.2.0
+ordered_set
 pytest
 coverage==7.2.3
 git+https://github.com/hpcaitech/pytest-testmon
diff --git a/tests/test_infer/_utils.py b/tests/test_infer/_utils.py
old mode 100644
new mode 100755
diff --git a/tests/test_infer/test_config_and_struct.py b/tests/test_infer/test_config_and_struct.py
old mode 100644
new mode 100755
index 329165025..c5302c206
--- a/tests/test_infer/test_config_and_struct.py
+++ b/tests/test_infer/test_config_and_struct.py
@@ -1,26 +1,45 @@
+import pytest
+
+import colossalai
 from colossalai.inference.config import InferenceConfig
-from colossalai.inference.struct import BatchInfo, RequsetStatus, Sequence
+from colossalai.inference.struct import BatchInfo, Sequence
+from colossalai.testing import spawn
 
 
-def test_config_and_inferenceData():
-    config = InferenceConfig("/llama")
-    assert config.max_batch_size
+def check_config_and_inference():
+    config = InferenceConfig()
+    assert config.max_batch_size == 8
     sequence = Sequence(
         request_id=1,
         prompt="abc",
-        token_id=[1, 2, 3],
+        input_token_id=[1, 2, 3],
         block_size=16,
         sample_params=None,
-        block_table_index=1,
+        block_table=None,
+        eos_token_id=2,
+        max_output_len=256,
     )
 
     sequence2 = Sequence(
         request_id=2,
         prompt="bcd",
-        token_id=[4, 5, 6],
+        input_token_id=[4, 5, 6],
+        block_size=16,
+        sample_params=None,
+        block_table=None,
+        eos_token_id=2,
+        max_output_len=256,
+    )
+
+    sequence3 = Sequence(
+        request_id=3,
+        prompt="efg",
+        input_token_id=[7, 8, 9],
         block_size=16,
         sample_params=None,
-        block_table_index=2,
+        block_table=None,
+        eos_token_id=2,
+        max_output_len=256,
     )
 
     assert sequence.get_sentence_len() == 3
@@ -29,15 +48,34 @@ def test_config_and_inferenceData():
     assert sequence.check_finish() == False
 
     batch = BatchInfo.init_batch([sequence])
-    assert batch.block_table[sequence.request_id] == sequence.block_table_index
-    sequence.status = RequsetStatus.COMPLETED
-    batch.fliter_batch()
-    assert batch.block_table == {}
-    batch.add_seqs([sequence2])
-    assert batch.block_table[sequence2.request_id] == sequence2.block_table_index
+    batch.add_seqs([sequence2, sequence3])
+    batch.add_seqs([sequence])
+
+    assert batch.is_empty() == False
+    assert batch.get_batch_size() == 3
+    batch.update_batch_tokens([1, 2, 3])
+    seq = batch.abort_seq(sequence)
+    seq2 = batch.fliter_batch()[0]
+
+    assert batch.get_batch_size() == 1
+    assert seq.get_output_len() == 1
+    assert seq.output_token_id == [1]
+    assert seq2.get_output_len() == 1
+    assert seq2.output_token_id == [2]
+
     batch.clear_batch()
-    assert batch.block_table == {}
+    assert batch.is_empty() == True
+
+
+def run_dist(rank, world_size, port):
+    colossalai.launch(config={}, rank=rank, world_size=world_size, port=port, host="localhost")
+    check_config_and_inference()
+
+
+@pytest.mark.dist
+def test_config_and_inference():
+    spawn(run_dist, 1)
 
 
 if __name__ == "__main__":
-    test_config_and_inferenceData()
+    test_config_and_inference()
diff --git a/tests/test_infer/test_inference_engine.py b/tests/test_infer/test_inference_engine.py
new file mode 100755
index 000000000..ec1f85b4c
--- /dev/null
+++ b/tests/test_infer/test_inference_engine.py
@@ -0,0 +1,44 @@
+import pytest
+import transformers
+from transformers import AutoTokenizer
+
+import colossalai
+from colossalai.inference.config import InferenceConfig
+from colossalai.inference.core.engine import InferenceEngine
+from colossalai.testing import spawn
+
+
+def check_inference_engine():
+    model = transformers.LlamaForCausalLM(
+        transformers.LlamaConfig(
+            vocab_size=20000, hidden_size=512, intermediate_size=1536, num_attention_heads=4, num_hidden_layers=4
+        )
+    )
+    tokenizer = AutoTokenizer.from_pretrained("hf-internal-testing/llama-tokenizer")
+    inference_config = InferenceConfig()
+    inference_engine = InferenceEngine(model, tokenizer, inference_config, verbose=True)
+
+    inputs = [
+        "介绍一下北京",
+        "介绍一下武汉",
+    ]
+
+    inference_engine.add_request(prompts=inputs)
+    outputs = inference_engine.generate(None)
+
+    for s1, s2 in zip(inputs, outputs):
+        assert s1 == s2
+
+
+def run_dist(rank, world_size, port):
+    colossalai.launch(config={}, rank=rank, world_size=world_size, port=port, host="localhost")
+    check_inference_engine()
+
+
+@pytest.mark.dist
+def test_inference_engine():
+    spawn(run_dist, 1)
+
+
+if __name__ == "__main__":
+    test_inference_engine()
diff --git a/tests/test_infer/test_kvcache_manager.py b/tests/test_infer/test_kvcache_manager.py
old mode 100644
new mode 100755
index 5187727f1..c5868a30e
--- a/tests/test_infer/test_kvcache_manager.py
+++ b/tests/test_infer/test_kvcache_manager.py
@@ -1,12 +1,14 @@
 import random
 
+import pytest
 import torch
 from transformers.models.llama import LlamaConfig
 
+import colossalai
 from colossalai.inference.config import InferenceConfig
 from colossalai.inference.kv_cache import CacheBlock, KVCacheManager
 from colossalai.logging import disable_existing_loggers
-from colossalai.testing import parameterize
+from colossalai.testing import parameterize, spawn
 
 
 @parameterize(
@@ -64,7 +66,7 @@ def test_logical_blocks(test_config):
         },
     ],
 )
-def test_cache_manager(test_config):
+def check_cache_manager(test_config):
     disable_existing_loggers()
 
     assert test_config["max_batch_size"] > 1
@@ -78,7 +80,7 @@ def test_cache_manager(test_config):
     max_input_length = test_config["max_input_len"]
     max_output_length = test_config["max_output_len"]
 
-    inference_config = InferenceConfig(model="", **test_config)
+    inference_config = InferenceConfig(**test_config)
     model_config = LlamaConfig(
         hidden_size=hidden_size,
         num_hidden_layers=num_layers,
@@ -147,6 +149,16 @@ def test_cache_manager(test_config):
     assert cache_manager.get_num_available_blocks() == num_blocks
 
 
+def run_dist(rank, world_size, port):
+    colossalai.launch(config={}, rank=rank, world_size=world_size, port=port, host="localhost")
+    check_cache_manager()
+
+
+@pytest.mark.dist
+def test_cache_manager():
+    spawn(run_dist, 1)
+
+
 if __name__ == "__main__":
     test_logical_blocks()
     test_cache_manager()