diff --git a/dbgpt/app/openapi/api_v1/api_v1.py b/dbgpt/app/openapi/api_v1/api_v1.py
index 3441ab8e0..6c3dd0d86 100644
--- a/dbgpt/app/openapi/api_v1/api_v1.py
+++ b/dbgpt/app/openapi/api_v1/api_v1.py
@@ -13,11 +13,8 @@ from dbgpt._private.config import Config
 from dbgpt.app.knowledge.request.request import KnowledgeSpaceRequest
 from dbgpt.app.knowledge.service import KnowledgeService
 from dbgpt.app.openapi.api_view_model import (
-    ChatCompletionResponseStreamChoice,
-    ChatCompletionStreamResponse,
     ChatSceneVo,
     ConversationVo,
-    DeltaMessage,
     MessageVo,
     Result,
 )
@@ -25,6 +22,11 @@ from dbgpt.app.scene import BaseChat, ChatFactory, ChatScene
 from dbgpt.component import ComponentType
 from dbgpt.configs.model_config import KNOWLEDGE_UPLOAD_ROOT_PATH
 from dbgpt.core.awel import CommonLLMHttpRequestBody, CommonLLMHTTPRequestContext
+from dbgpt.core.schema.api import (
+    ChatCompletionResponseStreamChoice,
+    ChatCompletionStreamResponse,
+    DeltaMessage,
+)
 from dbgpt.datasource.db_conn_info import DBConfig, DbTypeInfo
 from dbgpt.model.base import FlatSupportedModel
 from dbgpt.model.cluster import BaseModelController, WorkerManager, WorkerManagerFactory
diff --git a/dbgpt/app/openapi/api_v2.py b/dbgpt/app/openapi/api_v2.py
index 92857eadd..4ed8335d7 100644
--- a/dbgpt/app/openapi/api_v2.py
+++ b/dbgpt/app/openapi/api_v2.py
@@ -6,15 +6,6 @@ from typing import Optional
 
 from fastapi import APIRouter, Body, Depends, HTTPException
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
-from fastchat.protocol.api_protocol import (
-    ChatCompletionResponse,
-    ChatCompletionResponseChoice,
-    ChatCompletionResponseStreamChoice,
-    ChatCompletionStreamResponse,
-    ChatMessage,
-    DeltaMessage,
-    UsageInfo,
-)
 from starlette.responses import StreamingResponse
 
 from dbgpt.app.openapi.api_v1.api_v1 import (
@@ -26,9 +17,18 @@ from dbgpt.app.openapi.api_v1.api_v1 import (
     stream_generator,
 )
 from dbgpt.app.scene import BaseChat, ChatScene
-from dbgpt.client.schemas import ChatCompletionRequestBody, ChatMode
+from dbgpt.client.schema import ChatCompletionRequestBody, ChatMode
 from dbgpt.component import logger
 from dbgpt.core.awel import CommonLLMHttpRequestBody, CommonLLMHTTPRequestContext
+from dbgpt.core.schema.api import (
+    ChatCompletionResponse,
+    ChatCompletionResponseChoice,
+    ChatCompletionResponseStreamChoice,
+    ChatCompletionStreamResponse,
+    ChatMessage,
+    DeltaMessage,
+    UsageInfo,
+)
 from dbgpt.model.cluster.apiserver.api import APISettings
 from dbgpt.serve.agent.agents.controller import multi_agents
 from dbgpt.serve.flow.api.endpoints import get_service
diff --git a/dbgpt/app/openapi/api_view_model.py b/dbgpt/app/openapi/api_view_model.py
index cd4ccadfd..f3655e30a 100644
--- a/dbgpt/app/openapi/api_view_model.py
+++ b/dbgpt/app/openapi/api_view_model.py
@@ -89,21 +89,3 @@ class MessageVo(BaseModel):
     model_name
     """
     model_name: str
-
-
-class DeltaMessage(BaseModel):
-    role: Optional[str] = None
-    content: Optional[str] = None
-
-
-class ChatCompletionResponseStreamChoice(BaseModel):
-    index: int
-    delta: DeltaMessage
-    finish_reason: Optional[Literal["stop", "length"]] = None
-
-
-class ChatCompletionStreamResponse(BaseModel):
-    id: str = Field(default_factory=lambda: f"chatcmpl-{str(uuid.uuid1())}")
-    created: int = Field(default_factory=lambda: int(time.time()))
-    model: str
-    choices: List[ChatCompletionResponseStreamChoice]
diff --git a/dbgpt/client/app.py b/dbgpt/client/app.py
index f90a9906b..23f2f90ea 100644
--- a/dbgpt/client/app.py
+++ b/dbgpt/client/app.py
@@ -1,9 +1,10 @@
 """App Client API."""
 from typing import List
 
-from dbgpt.client import Client, ClientException
-from dbgpt.client.schemas import AppModel
-from dbgpt.serve.core import Result
+from dbgpt.core.schema.api import Result
+
+from .client import Client, ClientException
+from .schema import AppModel
 
 
 async def get_app(client: Client, app_id: str) -> AppModel:
diff --git a/dbgpt/client/client.py b/dbgpt/client/client.py
index 60d46ba9c..5f41529f0 100644
--- a/dbgpt/client/client.py
+++ b/dbgpt/client/client.py
@@ -5,10 +5,10 @@ from typing import Any, AsyncGenerator, List, Optional, Union
 from urllib.parse import urlparse
 
 import httpx
-from fastchat.protocol.api_protocol import ChatCompletionResponse
 
-from dbgpt.app.openapi.api_view_model import ChatCompletionStreamResponse
-from dbgpt.client.schemas import ChatCompletionRequestBody
+from dbgpt.core.schema.api import ChatCompletionResponse, ChatCompletionStreamResponse
+
+from .schema import ChatCompletionRequestBody
 
 CLIENT_API_PATH = "/api"
 CLIENT_SERVE_PATH = "/serve"
@@ -256,14 +256,14 @@ class Client:
                             )
                             yield chat_completion_response
                     except Exception as e:
-                        yield f"data:[SERVER_ERROR]{str(e)}\n\n"
+                        raise e
 
             else:
                 try:
                     error = await response.aread()
                     yield json.loads(error)
                 except Exception as e:
-                    yield f"data:[SERVER_ERROR]{str(e)}\n\n"
+                    raise e
 
     async def get(self, path: str, *args):
         """Get method.
diff --git a/dbgpt/client/flow.py b/dbgpt/client/flow.py
index eda995da6..f5206b2d1 100644
--- a/dbgpt/client/flow.py
+++ b/dbgpt/client/flow.py
@@ -1,9 +1,10 @@
 """this module contains the flow client functions."""
 from typing import List
 
-from dbgpt.client import Client, ClientException
 from dbgpt.core.awel.flow.flow_factory import FlowPanel
-from dbgpt.serve.core import Result
+from dbgpt.core.schema.api import Result
+
+from .client import Client, ClientException
 
 
 async def create_flow(client: Client, flow: FlowPanel) -> FlowPanel:
diff --git a/dbgpt/client/knowledge.py b/dbgpt/client/knowledge.py
index 323b51fcb..f8b3404ec 100644
--- a/dbgpt/client/knowledge.py
+++ b/dbgpt/client/knowledge.py
@@ -2,9 +2,10 @@
 import json
 from typing import List
 
-from dbgpt.client import Client, ClientException
-from dbgpt.client.schemas import DocumentModel, SpaceModel, SyncModel
-from dbgpt.serve.core import Result
+from dbgpt.core.schema.api import Result
+
+from .client import Client, ClientException
+from .schema import DocumentModel, SpaceModel, SyncModel
 
 
 async def create_space(client: Client, space_model: SpaceModel) -> SpaceModel:
diff --git a/dbgpt/client/schemas.py b/dbgpt/client/schema.py
similarity index 99%
rename from dbgpt/client/schemas.py
rename to dbgpt/client/schema.py
index aab0f0211..de33e5351 100644
--- a/dbgpt/client/schemas.py
+++ b/dbgpt/client/schema.py
@@ -4,8 +4,8 @@ from enum import Enum
 from typing import List, Optional, Union
 
 from fastapi import File, UploadFile
-from pydantic import BaseModel, Field
 
+from dbgpt._private.pydantic import BaseModel, Field
 from dbgpt.agent.resource.resource_api import AgentResource
 from dbgpt.rag.chunk_manager import ChunkParameters
 
diff --git a/dbgpt/core/schema/__init__.py b/dbgpt/core/schema/__init__.py
new file mode 100644
index 000000000..0acfbeaa4
--- /dev/null
+++ b/dbgpt/core/schema/__init__.py
@@ -0,0 +1 @@
+"""Module for common schemas."""
diff --git a/dbgpt/core/schema/api.py b/dbgpt/core/schema/api.py
new file mode 100644
index 000000000..647987b0f
--- /dev/null
+++ b/dbgpt/core/schema/api.py
@@ -0,0 +1,116 @@
+"""API schema module."""
+
+import time
+import uuid
+from typing import Any, Generic, List, Literal, Optional, TypeVar
+
+from dbgpt._private.pydantic import BaseModel, Field
+
+T = TypeVar("T")
+
+
+class Result(BaseModel, Generic[T]):
+    """Common result entity for API response."""
+
+    success: bool = Field(
+        ..., description="Whether it is successful, True: success, False: failure"
+    )
+    err_code: str | None = Field(None, description="Error code")
+    err_msg: str | None = Field(None, description="Error message")
+    data: T | None = Field(None, description="Return data")
+
+    @staticmethod
+    def succ(data: T) -> "Result[T]":
+        """Build a successful result entity.
+
+        Args:
+            data (T): Return data
+
+        Returns:
+            Result[T]: Result entity
+        """
+        return Result(success=True, err_code=None, err_msg=None, data=data)
+
+    @staticmethod
+    def failed(msg: str, err_code: Optional[str] = "E000X") -> "Result[Any]":
+        """Build a failed result entity.
+
+        Args:
+            msg (str): Error message
+            err_code (Optional[str], optional): Error code. Defaults to "E000X".
+        """
+        return Result(success=False, err_code=err_code, err_msg=msg, data=None)
+
+
+class DeltaMessage(BaseModel):
+    """Delta message entity for chat completion response."""
+
+    role: Optional[str] = None
+    content: Optional[str] = None
+
+
+class ChatCompletionResponseStreamChoice(BaseModel):
+    """Chat completion response choice entity."""
+
+    index: int = Field(..., description="Choice index")
+    delta: DeltaMessage = Field(..., description="Delta message")
+    finish_reason: Optional[Literal["stop", "length"]] = Field(
+        None, description="Finish reason"
+    )
+
+
+class ChatCompletionStreamResponse(BaseModel):
+    """Chat completion response stream entity."""
+
+    id: str = Field(
+        default_factory=lambda: f"chatcmpl-{str(uuid.uuid1())}", description="Stream ID"
+    )
+    created: int = Field(
+        default_factory=lambda: int(time.time()), description="Created time"
+    )
+    model: str = Field(..., description="Model name")
+    choices: List[ChatCompletionResponseStreamChoice] = Field(
+        ..., description="Chat completion response choices"
+    )
+
+
+class ChatMessage(BaseModel):
+    """Chat message entity."""
+
+    role: str = Field(..., description="Role of the message")
+    content: str = Field(..., description="Content of the message")
+
+
+class UsageInfo(BaseModel):
+    """Usage info entity."""
+
+    prompt_tokens: int = Field(0, description="Prompt tokens")
+    total_tokens: int = Field(0, description="Total tokens")
+    completion_tokens: Optional[int] = Field(0, description="Completion tokens")
+
+
+class ChatCompletionResponseChoice(BaseModel):
+    """Chat completion response choice entity."""
+
+    index: int = Field(..., description="Choice index")
+    message: ChatMessage = Field(..., description="Chat message")
+    finish_reason: Optional[Literal["stop", "length"]] = Field(
+        None, description="Finish reason"
+    )
+
+
+class ChatCompletionResponse(BaseModel):
+    """Chat completion response entity."""
+
+    id: str = Field(
+        default_factory=lambda: f"chatcmpl-{str(uuid.uuid1())}", description="Stream ID"
+    )
+    object: str = "chat.completion"
+    created: int = Field(
+        default_factory=lambda: int(time.time()), description="Created time"
+    )
+    model: str = Field(..., description="Model name")
+    choices: List[ChatCompletionResponseChoice] = Field(
+        ..., description="Chat completion response choices"
+    )
+    usage: UsageInfo = Field(..., description="Usage info")
diff --git a/dbgpt/model/utils/chatgpt_utils.py b/dbgpt/model/utils/chatgpt_utils.py
index d84861dd5..3dbb3f8a3 100644
--- a/dbgpt/model/utils/chatgpt_utils.py
+++ b/dbgpt/model/utils/chatgpt_utils.py
@@ -16,14 +16,7 @@ from typing import (
 
 from dbgpt._private.pydantic import model_to_json
 from dbgpt.core.awel import TransformStreamAbsOperator
-from dbgpt.core.awel.flow import (
-    IOField,
-    OperatorCategory,
-    OperatorType,
-    Parameter,
-    ResourceCategory,
-    ViewMetadata,
-)
+from dbgpt.core.awel.flow import IOField, OperatorCategory, OperatorType, ViewMetadata
 from dbgpt.core.interface.llm import ModelOutput
 from dbgpt.core.operators import BaseLLM
 
@@ -217,7 +210,8 @@ async def _to_openai_stream(
     import json
 
     import shortuuid
-    from fastchat.protocol.openai_api_protocol import (
+
+    from dbgpt.core.schema.api import (
         ChatCompletionResponseStreamChoice,
         ChatCompletionStreamResponse,
         DeltaMessage,
diff --git a/dbgpt/serve/core/schemas.py b/dbgpt/serve/core/schemas.py
index 5add79f30..698ac6805 100644
--- a/dbgpt/serve/core/schemas.py
+++ b/dbgpt/serve/core/schemas.py
@@ -1,12 +1,12 @@
 import logging
 import sys
-from typing import TYPE_CHECKING, Any, Generic, Optional, TypeVar
+from typing import TYPE_CHECKING
 
 from fastapi import HTTPException, Request
 from fastapi.exceptions import RequestValidationError
 from fastapi.responses import JSONResponse
 
-from dbgpt._private.pydantic import BaseModel, Field
+from dbgpt.core.schema.api import Result
 
 if sys.version_info < (3, 11):
     try:
@@ -18,40 +18,6 @@ if TYPE_CHECKING:
     from fastapi import FastAPI
 
 logger = logging.getLogger(__name__)
-T = TypeVar("T")
-
-
-class Result(BaseModel, Generic[T]):
-    """Common result entity class"""
-
-    success: bool = Field(
-        ..., description="Whether it is successful, True: success, False: failure"
-    )
-    err_code: str | None = Field(None, description="Error code")
-    err_msg: str | None = Field(None, description="Error message")
-    data: T | None = Field(None, description="Return data")
-
-    @staticmethod
-    def succ(data: T) -> "Result[T]":
-        """Build a successful result entity
-
-        Args:
-            data (T): Return data
-
-        Returns:
-            Result[T]: Result entity
-        """
-        return Result(success=True, err_code=None, err_msg=None, data=data)
-
-    @staticmethod
-    def failed(msg: str, err_code: Optional[str] = "E000X") -> "Result[Any]":
-        """Build a failed result entity
-
-        Args:
-            msg (str): Error message
-            err_code (Optional[str], optional): Error code. Defaults to "E000X".
-        """
-        return Result(success=False, err_code=err_code, err_msg=msg, data=None)
 
 
 async def validation_exception_handler(
diff --git a/dbgpt/serve/flow/service/service.py b/dbgpt/serve/flow/service/service.py
index 6deeb8985..a8811fa81 100644
--- a/dbgpt/serve/flow/service/service.py
+++ b/dbgpt/serve/flow/service/service.py
@@ -485,9 +485,7 @@ async def _chat_with_dag_task(
             if OpenAIStreamingOutputOperator and isinstance(
                 task, OpenAIStreamingOutputOperator
             ):
-                from fastchat.protocol.openai_api_protocol import (
-                    ChatCompletionResponseStreamChoice,
-                )
+                from dbgpt.core.schema.api import ChatCompletionResponseStreamChoice
 
                 previous_text = ""
                 async for output in await task.call_stream(request):
diff --git a/docs/docs/api/app.md b/docs/docs/api/app.md
index 013b4e297..f2cbec390 100644
--- a/docs/docs/api/app.md
+++ b/docs/docs/api/app.md
@@ -50,11 +50,12 @@ APP_ID="{YOUR_APP_ID}"
 client = Client(api_key=DBGPT_API_KEY)
 
 async for data in client.chat_stream(
-        messages="Introduce AWEL", 
-        model="chatgpt_proxyllm", 
-        chat_mode="chat_app", 
-        chat_param=APP_ID):
-            print(data)
+    messages="Introduce AWEL", 
+    model="chatgpt_proxyllm", 
+    chat_mode="chat_app", 
+    chat_param=APP_ID
+):
+    print(data)
 
 ```
  </TabItem>
diff --git a/docs/docs/api/chat.md b/docs/docs/api/chat.md
index 6cf3d2621..da64c99a8 100644
--- a/docs/docs/api/chat.md
+++ b/docs/docs/api/chat.md
@@ -45,6 +45,7 @@ import TabItem from '@theme/TabItem';
 from dbgpt.client import Client
 
 DBGPT_API_KEY = "dbgpt"
+client = Client(api_key=DBGPT_API_KEY)
 
 async for data in client.chat_stream(
     model="chatgpt_proxyllm",
diff --git a/docs/docs/api/flow.md b/docs/docs/api/flow.md
index 7e63e93cf..88be326d2 100644
--- a/docs/docs/api/flow.md
+++ b/docs/docs/api/flow.md
@@ -49,11 +49,12 @@ FLOW_ID="{YOUR_FLOW_ID}"
 
 client = Client(api_key=DBGPT_API_KEY)
 async for data in client.chat_stream(
-        messages="Introduce AWEL", 
-        model="chatgpt_proxyllm", 
-        chat_mode="chat_flow", 
-        chat_param=FLOW_ID):
-            print(data)
+    messages="Introduce AWEL", 
+    model="chatgpt_proxyllm", 
+    chat_mode="chat_flow", 
+    chat_param=FLOW_ID
+):
+    print(data)
 ```
  </TabItem>
 </Tabs>
diff --git a/docs/docs/api/knowledge.md b/docs/docs/api/knowledge.md
index b19be1478..8810f05fb 100644
--- a/docs/docs/api/knowledge.md
+++ b/docs/docs/api/knowledge.md
@@ -49,11 +49,12 @@ SPACE_NAME="{YOUR_SPACE_NAME}"
 client = Client(api_key=DBGPT_API_KEY)
 
 async for data in client.chat_stream(
-        messages="Introduce AWEL", 
-        model="chatgpt_proxyllm", 
-        chat_mode="chat_knowledge", 
-        chat_param=SPACE_NAME):
-            print(data)
+    messages="Introduce AWEL", 
+    model="chatgpt_proxyllm", 
+    chat_mode="chat_knowledge", 
+    chat_param=SPACE_NAME
+):
+    print(data)
 ```
  </TabItem>
 </Tabs>
@@ -343,21 +344,20 @@ POST /api/v2/serve/knowledge/spaces
 
 <TabItem value="python_knowledge">
 
-
 ```python
 from dbgpt.client import Client
 from dbgpt.client.knowledge import create_space
-from dbgpt.client.schemas import SpaceModel
+from dbgpt.client.schema import SpaceModel
 
 DBGPT_API_KEY = "dbgpt"
 
 client = Client(api_key=DBGPT_API_KEY)
-res = await create_space(client,SpaceModel(
-  name="test_space", 
-  vector_type="Chroma", 
-  desc="for client space", 
-  owner="dbgpt"))
-
+res = await create_space(client, SpaceModel(
+    name="test_space",
+    vector_type="Chroma",
+    desc="for client space",
+    owner="dbgpt"
+))
 ```
 
  </TabItem>
@@ -420,20 +420,20 @@ PUT /api/v2/serve/knowledge/spaces
 
 <TabItem value="python_update_knowledge">
 
-
 ```python
 from dbgpt.client import Client
 from dbgpt.client.knowledge import update_space
-from dbgpt.client.schemas import SpaceModel
+from dbgpt.client.schema import SpaceModel
 
 DBGPT_API_KEY = "dbgpt"
 
 client = Client(api_key=DBGPT_API_KEY)
 res = await update_space(client, SpaceModel(
-  name="test_space", 
-  vector_type="Chroma", 
-  desc="for client space update", 
-  owner="dbgpt"))
+    name="test_space",
+    vector_type="Chroma",
+    desc="for client space update",
+    owner="dbgpt"
+))
 
 ```
 
diff --git a/examples/client/knowledge_crud_example.py b/examples/client/knowledge_crud_example.py
index f3533bea2..879984255 100644
--- a/examples/client/knowledge_crud_example.py
+++ b/examples/client/knowledge_crud_example.py
@@ -66,7 +66,7 @@ import asyncio
 
 from dbgpt.client import Client
 from dbgpt.client.knowledge import create_space
-from dbgpt.client.schemas import SpaceModel
+from dbgpt.client.schema import SpaceModel
 
 
 async def main():