diff --git a/pilot/configs/config.py b/pilot/configs/config.py
index 4d695da7d..8c03769b4 100644
--- a/pilot/configs/config.py
+++ b/pilot/configs/config.py
@@ -163,7 +163,9 @@ class Config(metaclass=Singleton):
         ### EMBEDDING Configuration
         self.EMBEDDING_MODEL = os.getenv("EMBEDDING_MODEL", "text2vec")
         self.KNOWLEDGE_CHUNK_SIZE = int(os.getenv("KNOWLEDGE_CHUNK_SIZE", 100))
+        self.KNOWLEDGE_CHUNK_OVERLAP = int(os.getenv("KNOWLEDGE_CHUNK_OVERLAP", 100))
         self.KNOWLEDGE_SEARCH_TOP_SIZE = int(os.getenv("KNOWLEDGE_SEARCH_TOP_SIZE", 5))
+        self.KNOWLEDGE_SEARCH_MAX_TOKEN = int(os.getenv("KNOWLEDGE_SEARCH_MAX_TOKEN", 2000))
         ### SUMMARY_CONFIG Configuration
         self.SUMMARY_CONFIG = os.getenv("SUMMARY_CONFIG", "FAST")
 
diff --git a/pilot/scene/chat_knowledge/v1/chat.py b/pilot/scene/chat_knowledge/v1/chat.py
index e075634de..ef6b281c7 100644
--- a/pilot/scene/chat_knowledge/v1/chat.py
+++ b/pilot/scene/chat_knowledge/v1/chat.py
@@ -20,6 +20,7 @@ from pilot.configs.model_config import (
 
 from pilot.scene.chat_knowledge.v1.prompt import prompt
 from pilot.embedding_engine.embedding_engine import EmbeddingEngine
+from pilot.server.knowledge.service import KnowledgeService
 
 CFG = Config()
 
@@ -36,6 +37,18 @@ class ChatKnowledge(BaseChat):
             chat_session_id=chat_session_id,
             current_user_input=user_input,
         )
+        self.space_context = self.get_space_context(knowledge_space)
+        self.top_k = (
+            CFG.KNOWLEDGE_SEARCH_TOP_SIZE
+            if self.space_context is None
+            else int(self.space_context["embedding"]["topk"])
+        )
+        # self.recall_score = CFG.KNOWLEDGE_SEARCH_TOP_SIZE if self.space_context is None else self.space_context["embedding"]["recall_score"]
+        self.max_token = (
+            CFG.KNOWLEDGE_SEARCH_MAX_TOKEN
+            if self.space_context is None
+            else int(self.space_context["prompt"]["max_token"])
+        )
         vector_store_config = {
             "vector_store_name": knowledge_space,
             "vector_store_type": CFG.VECTOR_STORE_TYPE,
@@ -48,11 +61,14 @@ class ChatKnowledge(BaseChat):
 
     def generate_input_values(self):
         try:
+            if self.space_context:
+                prompt.template_define = self.space_context["prompt"]["scene"]
+                prompt.template = self.space_context["prompt"]["template"]
             docs = self.knowledge_embedding_client.similar_search(
-                self.current_user_input, CFG.KNOWLEDGE_SEARCH_TOP_SIZE
+                self.current_user_input, self.top_k
             )
             context = [d.page_content for d in docs]
-            context = context[:2000]
+            context = context[: self.max_token]
             input_values = {"context": context, "question": self.current_user_input}
         except NoIndexException:
             raise ValueError(
@@ -63,3 +79,7 @@ class ChatKnowledge(BaseChat):
     @property
     def chat_type(self) -> str:
         return ChatScene.ChatKnowledge.value()
+
+    def get_space_context(self, space_name):
+        service = KnowledgeService()
+        return service.get_space_context(space_name)
diff --git a/pilot/server/knowledge/api.py b/pilot/server/knowledge/api.py
index 737b779bc..b6aef1ab3 100644
--- a/pilot/server/knowledge/api.py
+++ b/pilot/server/knowledge/api.py
@@ -20,6 +20,7 @@ from pilot.server.knowledge.request.request import (
     DocumentSyncRequest,
     ChunkQueryRequest,
     DocumentQueryRequest,
+    SpaceArgumentRequest,
 )
 
 from pilot.server.knowledge.request.request import KnowledgeSpaceRequest
@@ -54,13 +55,33 @@ def space_list(request: KnowledgeSpaceRequest):
 
 @router.post("/knowledge/space/delete")
 def space_delete(request: KnowledgeSpaceRequest):
-    print(f"/space/list params:")
+    print(f"/space/delete params:")
     try:
         return Result.succ(knowledge_space_service.delete_space(request.name))
     except Exception as e:
         return Result.faild(code="E000X", msg=f"space list error {e}")
 
 
+@router.post("/knowledge/{space_name}/arguments")
+def arguments(space_name: str):
+    print(f"/knowledge/space/arguments params:")
+    try:
+        return Result.succ(knowledge_space_service.arguments(space_name))
+    except Exception as e:
+        return Result.faild(code="E000X", msg=f"space list error {e}")
+
+
+@router.post("/knowledge/{space_name}/argument/save")
+def arguments_save(space_name: str, argument_request: SpaceArgumentRequest):
+    print(f"/knowledge/space/argument/save params:")
+    try:
+        return Result.succ(
+            knowledge_space_service.argument_save(space_name, argument_request)
+        )
+    except Exception as e:
+        return Result.faild(code="E000X", msg=f"space list error {e}")
+
+
 @router.post("/knowledge/{space_name}/document/add")
 def document_add(space_name: str, request: KnowledgeDocumentRequest):
     print(f"/document/add params: {space_name}, {request}")
diff --git a/pilot/server/knowledge/request/request.py b/pilot/server/knowledge/request/request.py
index d393ca9b7..f0c47abeb 100644
--- a/pilot/server/knowledge/request/request.py
+++ b/pilot/server/knowledge/request/request.py
@@ -83,3 +83,9 @@ class KnowledgeQueryResponse:
     score: float = 0.0
     """text: raw text info"""
     text: str
+
+
+class SpaceArgumentRequest(BaseModel):
+    """argument: argument"""
+
+    argument: str
diff --git a/pilot/server/knowledge/request/response.py b/pilot/server/knowledge/request/response.py
index d302eb392..fb7aa55e9 100644
--- a/pilot/server/knowledge/request/response.py
+++ b/pilot/server/knowledge/request/response.py
@@ -32,6 +32,8 @@ class SpaceQueryResponse(BaseModel):
     vector_type: str = None
     """desc: description"""
     desc: str = None
+    """context: context"""
+    context: str = None
     """owner: owner"""
     owner: str = None
     gmt_created: str = None
diff --git a/pilot/server/knowledge/service.py b/pilot/server/knowledge/service.py
index 3f863e0c4..60745a118 100644
--- a/pilot/server/knowledge/service.py
+++ b/pilot/server/knowledge/service.py
@@ -1,3 +1,4 @@
+import json
 import threading
 from datetime import datetime
 
@@ -25,6 +26,7 @@ from pilot.server.knowledge.request.request import (
     KnowledgeDocumentRequest,
     DocumentQueryRequest,
     ChunkQueryRequest,
+    SpaceArgumentRequest,
 )
 from enum import Enum
 
@@ -102,12 +104,34 @@ class KnowledgeService:
             res.gmt_created = space.gmt_created
             res.gmt_modified = space.gmt_modified
             res.owner = space.owner
+            res.context = space.context
             query = KnowledgeDocumentEntity(space=space.name)
             doc_count = knowledge_document_dao.get_knowledge_documents_count(query)
             res.docs = doc_count
             responses.append(res)
         return responses
 
+    def arguments(self, space_name):
+        query = KnowledgeSpaceEntity(name=space_name)
+        spaces = knowledge_space_dao.get_knowledge_space(query)
+        if len(spaces) != 1:
+            raise Exception(f"there are no or more than one space called {space_name}")
+        space = spaces[0]
+        if space.context is None:
+            context = self._build_default_context()
+        else:
+            context = space.context
+        return json.loads(context)
+
+    def argument_save(self, space_name, argument_request: SpaceArgumentRequest):
+        query = KnowledgeSpaceEntity(name=space_name)
+        spaces = knowledge_space_dao.get_knowledge_space(query)
+        if len(spaces) != 1:
+            raise Exception(f"there are no or more than one space called {space_name}")
+        space = spaces[0]
+        space.context = argument_request.argument
+        return knowledge_space_dao.update_knowledge_space(space)
+
     """get knowledge get_knowledge_documents"""
 
     def get_knowledge_documents(self, space, request: DocumentQueryRequest):
@@ -142,22 +166,34 @@ class KnowledgeService:
                     f" doc:{doc.doc_name} status is {doc.status}, can not sync"
                 )
 
+            space_context = self.get_space_context(space_name)
+            chunk_size = (
+                CFG.KNOWLEDGE_CHUNK_SIZE
+                if space_context is None
+                else int(space_context["embedding"]["chunk_size"])
+            )
+            chunk_overlap = (
+                CFG.KNOWLEDGE_CHUNK_OVERLAP
+                if space_context is None
+                else int(space_context["embedding"]["chunk_overlap"])
+            )
             if CFG.LANGUAGE == "en":
                 text_splitter = RecursiveCharacterTextSplitter(
-                    chunk_size=CFG.KNOWLEDGE_CHUNK_SIZE,
-                    chunk_overlap=20,
+                    chunk_size=chunk_size,
+                    chunk_overlap=chunk_overlap,
                     length_function=len,
                 )
             else:
                 try:
                     text_splitter = SpacyTextSplitter(
                         pipeline="zh_core_web_sm",
-                        chunk_size=CFG.KNOWLEDGE_CHUNK_SIZE,
-                        chunk_overlap=100,
+                        chunk_size=chunk_size,
+                        chunk_overlap=chunk_overlap
                     )
                 except Exception:
                     text_splitter = RecursiveCharacterTextSplitter(
-                        chunk_size=CFG.KNOWLEDGE_CHUNK_SIZE, chunk_overlap=50
+                        chunk_size=chunk_size,
+                        chunk_overlap=chunk_overlap,
                     )
             client = EmbeddingEngine(
                 knowledge_source=doc.content,
@@ -287,3 +323,40 @@ class KnowledgeService:
             doc.result = "document embedding failed" + str(e)
             logger.error(f"document embedding, failed:{doc.doc_name}, {str(e)}")
         return knowledge_document_dao.update_knowledge_document(doc)
+
+    def _build_default_context(self):
+        from pilot.scene.chat_knowledge.v1.prompt import (
+            PROMPT_SCENE_DEFINE,
+            _DEFAULT_TEMPLATE,
+        )
+
+        context_template = {
+            "embedding": {
+                "topk": CFG.KNOWLEDGE_SEARCH_TOP_SIZE,
+                "recall_score": 0.0,
+                "recall_type": "TopK",
+                "model": CFG.EMBEDDING_MODEL,
+                "chunk_size": CFG.KNOWLEDGE_CHUNK_SIZE,
+                "chunk_overlap": CFG.KNOWLEDGE_CHUNK_OVERLAP,
+            },
+            "prompt": {
+                "max_token": 2000,
+                "scene": PROMPT_SCENE_DEFINE,
+                "template": _DEFAULT_TEMPLATE,
+            },
+        }
+        context_template_string = json.dumps(context_template, indent=4)
+        return context_template_string
+
+    def get_space_context(self, space_name):
+        request = KnowledgeSpaceRequest()
+        request.name = space_name
+        spaces = self.get_knowledge_space(request)
+        if len(spaces) != 1:
+            raise Exception(
+                f"have not found {space_name} space or found more than one space called {space_name}"
+            )
+        space = spaces[0]
+        if space.context is not None:
+            return json.loads(spaces[0].context)
+        return None
diff --git a/pilot/server/knowledge/space_db.py b/pilot/server/knowledge/space_db.py
index 911683fdd..57a909e06 100644
--- a/pilot/server/knowledge/space_db.py
+++ b/pilot/server/knowledge/space_db.py
@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from sqlalchemy import Column, Integer, String, DateTime, create_engine
+from sqlalchemy import Column, Integer, Text, String, DateTime, create_engine
 from sqlalchemy.ext.declarative import declarative_base
 
 from pilot.configs.config import Config
@@ -19,11 +19,12 @@ class KnowledgeSpaceEntity(Base):
     vector_type = Column(String(100))
     desc = Column(String(100))
     owner = Column(String(100))
+    context = Column(Text)
     gmt_created = Column(DateTime)
     gmt_modified = Column(DateTime)
 
     def __repr__(self):
-        return f"KnowledgeSpaceEntity(id={self.id}, name='{self.name}', vector_type='{self.vector_type}', desc='{self.desc}', owner='{self.owner}', gmt_created='{self.gmt_created}', gmt_modified='{self.gmt_modified}')"
+        return f"KnowledgeSpaceEntity(id={self.id}, name='{self.name}', vector_type='{self.vector_type}', desc='{self.desc}', owner='{self.owner}' context='{self.context}', gmt_created='{self.gmt_created}', gmt_modified='{self.gmt_modified}')"
 
 
 class KnowledgeSpaceDao:
@@ -88,14 +89,12 @@ class KnowledgeSpaceDao:
         session.close()
         return result
 
-    def update_knowledge_space(self, space_id: int, space: KnowledgeSpaceEntity):
-        cursor = self.conn.cursor()
-        query = "UPDATE knowledge_space SET name = %s, vector_type = %s, desc = %s, owner = %s WHERE id = %s"
-        cursor.execute(
-            query, (space.name, space.vector_type, space.desc, space.owner, space_id)
-        )
-        self.conn.commit()
-        cursor.close()
+    def update_knowledge_space(self, space: KnowledgeSpaceEntity):
+        session = self.Session()
+        session.merge(space)
+        session.commit()
+        session.close()
+        return True
 
     def delete_knowledge_space(self, space: KnowledgeSpaceEntity):
         session = self.Session()
diff --git a/pilot/vector_store/chroma_store.py b/pilot/vector_store/chroma_store.py
index e47a11761..451d9952c 100644
--- a/pilot/vector_store/chroma_store.py
+++ b/pilot/vector_store/chroma_store.py
@@ -1,4 +1,5 @@
 import os
+from typing import Any
 
 from chromadb.config import Settings
 from langchain.vectorstores import Chroma
@@ -20,13 +21,15 @@ class ChromaStore(VectorStoreBase):
             persist_directory=self.persist_dir,
             anonymized_telemetry=False,
         )
+        collection_metadata = {"hnsw:space": "cosine"}
         self.vector_store_client = Chroma(
             persist_directory=self.persist_dir,
             embedding_function=self.embeddings,
             client_settings=chroma_settings,
+            collection_metadata=collection_metadata
         )
 
-    def similar_search(self, text, topk) -> None:
+    def similar_search(self, text, topk,  **kwargs: Any) -> None:
         logger.info("ChromaStore similar search")
         return self.vector_store_client.similarity_search(text, topk)
 
diff --git a/pilot/vector_store/connector.py b/pilot/vector_store/connector.py
index ca56986c8..a1fce8360 100644
--- a/pilot/vector_store/connector.py
+++ b/pilot/vector_store/connector.py
@@ -1,9 +1,8 @@
 from pilot.vector_store.chroma_store import ChromaStore
 
 from pilot.vector_store.milvus_store import MilvusStore
-from pilot.vector_store.weaviate_store import WeaviateStore
 
-connector = {"Chroma": ChromaStore, "Milvus": MilvusStore, "Weaviate": WeaviateStore}
+connector = {"Chroma": ChromaStore, "Milvus": MilvusStore}
 
 
 class VectorStoreConnector: