diff --git a/backend/app/config.py b/backend/app/config.py
index 4705d43..c946cf9 100644
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -70,7 +70,8 @@ DB_NAME = _get_str("DB_NAME")
 
 # 完整连接字符串（直接从环境变量读取）
 DB_URI = _get_str("DB_URI")
-
+if not DB_URI and all([DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME]):
+    DB_URI = f"postgresql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?sslmode=disable"
 
 # ========== 后端服务配置 ==========
 BACKEND_PORT = _get_int("BACKEND_PORT")
diff --git a/backend/rag_core/config.py b/backend/rag_core/config.py
index 1a1ccd3..adc6ee1 100644
--- a/backend/rag_core/config.py
+++ b/backend/rag_core/config.py
@@ -46,7 +46,8 @@ DB_NAME = _get_str("DB_NAME")
 
 # 完整连接字符串（直接从环境变量读取）
 DB_URI = _get_str("DB_URI")
-
+if not DB_URI and all([DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME]):
+    DB_URI = f"postgresql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?sslmode=disable"
 # 文档存储 URI（直接从环境变量读取，默认同 DB_URI）
 DOCSTORE_URI = _get_str("DOCSTORE_URI") or DB_URI
 
diff --git a/rag_indexer/config.py b/rag_indexer/config.py
index 1ad0794..a4da69b 100644
--- a/rag_indexer/config.py
+++ b/rag_indexer/config.py
@@ -54,7 +54,8 @@ DB_NAME = _get_str("DB_NAME")
 
 # 完整连接字符串（直接从环境变量读取）
 DB_URI = _get_str("DB_URI")
-
+if not DB_URI and all([DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME]):
+    DB_URI = f"postgresql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?sslmode=disable"
 # 文档存储 URI（直接从环境变量读取，默认同 DB_URI）
 DOCSTORE_URI = _get_str("DOCSTORE_URI") or DB_URI