diff --git a/nodes.py b/nodes.py
index 1adc96c..ac8fc8d 100644
--- a/nodes.py
+++ b/nodes.py
@@ -15,13 +15,18 @@ class GeminiImage(OpenAICompatibleNode):
     ]
     EXTEND_INPUT = {
         "required": {
-            "aspect_ratio": (["1:1", "2:3", "3:2", "3:4", "4:3", "4:5", "5:4", "9:16", "16:9", "21:9"],
-                             {"default": "16:9"}),
+            "aspect_ratio": (["默认","1:1", "2:3", "3:2", "3:4", "4:3", "4:5", "5:4", "9:16", "16:9", "21:9"],
+                             {"default": "默认"}),
             "seed": ("INT", {"default": "-1", "min": -1, "max": 2147483647,
                              "enabled": ["gemini-3-pro-image"]}),
         }
     }
 
+    def post_input(self, payload: dict, timeout: int, extra_params: dict, reference_image=None, **kwargs):
+        if kwargs["aspect_ratio"] == "默认":
+            del kwargs["aspect_ratio"]
+        return payload, timeout, extra_params, reference_image, kwargs
+
 
 class WanxiangImage(OpenAICompatibleNode):
     SUPPORTED_MODELS = [