diff --git a/api/core/tools/provider/builtin/stepfun/tools/image.py b/api/core/tools/provider/builtin/stepfun/tools/image.py
index 5e544aada63b40..91f6e2c188cac1 100644
--- a/api/core/tools/provider/builtin/stepfun/tools/image.py
+++ b/api/core/tools/provider/builtin/stepfun/tools/image.py
@@ -17,7 +17,7 @@ def _invoke(self,
         """
             invoke tools
         """
-        base_url = self.runtime.credentials.get('stepfun_base_url', None)
+        base_url = self.runtime.credentials.get('stepfun_base_url', 'https://api.stepfun.com')
         if not base_url:
             base_url = None
         else: