diff --git a/internlm/initialize/launch.py b/internlm/initialize/launch.py
index fa3ae79..bcefde4 100644
--- a/internlm/initialize/launch.py
+++ b/internlm/initialize/launch.py
@@ -115,7 +115,8 @@ def args_sanity_check():
                 data.packed_length == data.seq_len * data.micro_bsz
             ), "'packed_length' must be equal to 'seq_len * micro_bsz'"
     else:
-        assert data.packed_length is not None, "'packed_length' must be given a value"
+        assert data.get("packed_length", None) is not None, "'packed_length' must be given a value"
+        assert data.packed_length % data.seq_len == 0, "'packed_length' must be divisible by 'seq_len'"
 
     if "micro_num" not in data:
         data._add_item("micro_num", 1)
diff --git a/internlm/train/training_internlm.py b/internlm/train/training_internlm.py
index 067ce75..35496f3 100644
--- a/internlm/train/training_internlm.py
+++ b/internlm/train/training_internlm.py
@@ -301,9 +301,7 @@ def get_validation_data_loader(
         else:
             # making the batch_size of validate larger can speed up the evaluation, but it should not be too large,
             # otherwise too much data may be dropped
-            micro_bsz = data_cfg.packed_length // gpc.config.SEQ_LEN
-            batch_size = min(data_cfg.valid_micro_num * micro_bsz, len(ds) // gpc.get_world_size(ParallelMode.DATA))
-            batch_size = batch_size // micro_bsz * micro_bsz
+            batch_size = min(data_cfg.valid_micro_num, len(ds) // gpc.get_world_size(ParallelMode.DATA))
 
             if batch_size == 0 and gpc.is_rank_for_log():
                 logger.info(f"skip validate {val_name}.")
diff --git a/internlm/utils/evaluation.py b/internlm/utils/evaluation.py
index 3e1a311..d460c6e 100644
--- a/internlm/utils/evaluation.py
+++ b/internlm/utils/evaluation.py
@@ -70,7 +70,6 @@ def evaluate_on_val_dls(
         torch.cuda.empty_cache()
         trainer.eval()
         verbose = gpc.is_rank_for_log()
-        data_cfg = gpc.config.data
 
         for val_name, val_dl in val_dls.items():
             if not streaming and len(val_dl) == 0 and verbose:
@@ -96,12 +95,9 @@ def evaluate_on_val_dls(
             ):
                 moe_loss = None
                 with torch.inference_mode():
-                    micro_bsz = data_cfg.packed_length // gpc.config.SEQ_LEN
                     if gpc.is_using_pp():
-                        total_val_bsz = len(batch[1])
-                        assert total_val_bsz % micro_bsz == 0
-                        num_microbatches = total_val_bsz // micro_bsz
-                        tensor_shape = torch.Size([micro_bsz, batch[0]["input_ids"].shape[1], gpc.config.HIDDEN_SIZE])
+                        num_microbatches = len(batch[1])
+                        tensor_shape = torch.Size([1, batch[0]["input_ids"].shape[1], gpc.config.HIDDEN_SIZE])
 
                         with switch_evaluation_pipeline_scheduler(
                             trainer=trainer,
@@ -119,8 +115,7 @@ def evaluate_on_val_dls(
                                     batch, forward_only=True, return_loss=True, return_output_label=False
                                 )
                     else:
-                        total_val_bsz = len(batch[1])
-                        grad_accum_size = total_val_bsz // micro_bsz
+                        grad_accum_size = len(batch[1])
                         with switch_evaluation_no_pipeline_scheduler(
                             trainer=trainer,
                             grad_accum_size=grad_accum_size,