diff --git a/api.py b/api.py
index 693c70a..fd74458 100644
--- a/api.py
+++ b/api.py
@@ -1,12 +1,31 @@
-from fastapi import FastAPI, Request
-from transformers import AutoTokenizer, AutoModel
-import uvicorn, json, datetime
+import datetime
+from contextlib import asynccontextmanager
+
 import torch
+import uvicorn
+from fastapi import FastAPI
+from pydantic import BaseModel
+from transformers import AutoModel, AutoTokenizer
 
 DEVICE = "cuda"
 DEVICE_ID = "0"
 CUDA_DEVICE = f"{DEVICE}:{DEVICE_ID}" if DEVICE_ID else DEVICE
 
+models = {}
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    models['chat'] = AutoModel.from_pretrained(
+        "THUDM/chatglm-6b", 
+        trust_remote_code=True).half().cuda()
+    models['chat'].eval()
+    models['tokenizer'] = AutoTokenizer.from_pretrained(
+        "THUDM/chatglm-6b", 
+        trust_remote_code=True)
+    yield
+    for model in models.values():
+        del model
+        torch_gc()
 
 def torch_gc():
     if torch.cuda.is_available():
@@ -14,43 +33,34 @@ def torch_gc():
             torch.cuda.empty_cache()
             torch.cuda.ipc_collect()
 
+app = FastAPI(lifespan=lifespan)
 
-app = FastAPI()
+class Item(BaseModel):
+    prompt: str = "你好"
+    history: list[tuple[str, str]] = []
+    max_length: int = 2048
+    top_p: float = 0.7
+    temperature: float = 0.95 
 
+class Answer(BaseModel):
+    response: str
+    history: list[tuple[str, str]]
+    status: int
+    time: str
 
 @app.post("/")
-async def create_item(request: Request):
-    global model, tokenizer
-    json_post_raw = await request.json()
-    json_post = json.dumps(json_post_raw)
-    json_post_list = json.loads(json_post)
-    prompt = json_post_list.get('prompt')
-    history = json_post_list.get('history')
-    max_length = json_post_list.get('max_length')
-    top_p = json_post_list.get('top_p')
-    temperature = json_post_list.get('temperature')
-    response, history = model.chat(tokenizer,
-                                   prompt,
-                                   history=history,
-                                   max_length=max_length if max_length else 2048,
-                                   top_p=top_p if top_p else 0.7,
-                                   temperature=temperature if temperature else 0.95)
+async def create_item(item: Item):
+    response, history = models['chat'].chat(
+        models['tokenizer'],
+        item.prompt,
+        history=item.history,
+        max_length=item.max_length,
+        top_p=item.top_p,
+        temperature=item.temperature)
     now = datetime.datetime.now()
     time = now.strftime("%Y-%m-%d %H:%M:%S")
-    answer = {
-        "response": response,
-        "history": history,
-        "status": 200,
-        "time": time
-    }
-    log = "[" + time + "] " + '", prompt:"' + prompt + '", response:"' + repr(response) + '"'
-    print(log)
-    torch_gc()
-    return answer
-
+    print(f"[{time}] prompt: '{item.prompt}', response: '{response}'")
+    return Answer(response=response, history=history, status=200, time=time)
 
 if __name__ == '__main__':
-    tokenizer = AutoTokenizer.from_pretrained("THUDM/chatglm-6b", trust_remote_code=True)
-    model = AutoModel.from_pretrained("THUDM/chatglm-6b", trust_remote_code=True).half().cuda()
-    model.eval()
     uvicorn.run(app, host='0.0.0.0', port=8000, workers=1)
diff --git a/api_test.py b/api_test.py
new file mode 100644
index 0000000..1db6cbd
--- /dev/null
+++ b/api_test.py
@@ -0,0 +1,28 @@
+import unittest
+from httpx import AsyncClient
+
+class TestGenerateChat(unittest.IsolatedAsyncioTestCase):
+    """
+    测试生成聊天内容
+    1. 先启动服务
+    ```bash
+    python api.py
+    ```
+    2. 运行测试
+    ```bash
+    python -m unittest api_test.py
+    ```
+    """
+    async def test_generate_chat(self):
+        async with AsyncClient() as ac:
+            response = await ac.post(
+                "http://localhost:8000/",
+                json={
+                    "prompt": "你好",
+                    "history": [],
+                    "max_length": 2048,
+                    "top_p": 0.7,
+                    "temperature": 0.95
+                })
+        self.assertEqual(response.status_code, 200)
+        print(response.json())
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