diff --git a/backend/.env.example b/backend/.env.example
index 9be4eb2..231ef29 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -65,6 +65,13 @@ VECTOR_STORE_TYPE=chroma
 # The name of the collection in your vector database
 VECTOR_STORE_COLLECTION=default
 
+GRAPH_STORE_TYPE = 
+
+#----------   neo4j - PropertyGraph    ----------------
+NEO4J_USERNAME = neo4j
+NEO4J_PASSWORD = neo4j
+NEO4J_URL = bolt://10.1.6.40:7687
+
 # The API endpoint for your vector database
 # VECTOR_STORE_HOST=
 
@@ -76,6 +83,7 @@ VECTOR_STORE_COLLECTION=default
 # Otherwise, use VECTOR_STORE__HOST and VECTOR_STORE__PORT config above
 VECTOR_STORE_PATH=./storage_vector
 BM_RETRIEVER_PATH =./storage_bm
+GRAPH_STORAGE_PATH =./storage_graph
 
 
 PHOENIX_API_KEY=123456
@@ -110,4 +118,6 @@ PROJECT_TITLE = "您好，我是博微工程理解小助手，您可以问我有
 CHAT_UPLOAD_FILECACHE = "./output/uploaded"
 
 JIEBA_DATA=./nltk_data
-NLTK_DATA=./nltk_data
\ No newline at end of file
+NLTK_DATA=./nltk_data
+
+PYTHONUTF8=1
\ No newline at end of file
diff --git a/backend/app/engine/graph/propertyGraph.py b/backend/app/engine/graph/propertyGraph.py
index a76b3dd..accad65 100644
--- a/backend/app/engine/graph/propertyGraph.py
+++ b/backend/app/engine/graph/propertyGraph.py
@@ -40,7 +40,7 @@ class PropertyGraph:
         if GRAPH_STORE_TYPE == 'neo4j':
             index = PropertyGraphIndex.from_existing(property_graph_store= get_Neo4j_Graph_Store(self._prjFlag))
         else:
-            GRAPH_STORAGE_DIR = os.getenv("GRAPH_STORAGE_DIR", "storage_graph")
+            GRAPH_STORAGE_DIR = os.getenv("GRAPH_STORAGE_PATH", "storage_graph")
             prjCachePath = GRAPH_STORAGE_DIR + f"/{self._prjFlag}"
             if not os.path.exists(prjCachePath):
                 return None