diff --git a/app/integrations/wx_finance_sdk.py b/app/integrations/wx_finance_sdk.py
index b6e92a3..5bbe98a 100644
--- a/app/integrations/wx_finance_sdk.py
+++ b/app/integrations/wx_finance_sdk.py
@@ -50,9 +50,9 @@ class WxFinanceSdk:
             ctypes.c_char_p, ctypes.c_char_p, ctypes.c_int, ctypes.c_void_p,
         ]
         lib.GetChatData.restype = ctypes.c_int
-        lib.DecryptData.argtypes = [
-            ctypes.c_void_p, ctypes.c_char_p, ctypes.c_char_p, ctypes.c_void_p,
-        ]
+        # ⚠️ DecryptData 不吃 sdk 句柄(与 GetChatData 不同, 它是纯解密函数)——只有 3 个参数,
+        # 多传 sdk 会让参数错位、encrypt_key 收到 sdk 指针 → DecryptData 返 10008(解析 encrypt_key 出错)。
+        lib.DecryptData.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_void_p]
         lib.DecryptData.restype = ctypes.c_int
         lib.NewSlice.restype = ctypes.c_void_p
         lib.FreeSlice.argtypes = [ctypes.c_void_p]
@@ -87,7 +87,7 @@ class WxFinanceSdk:
         aes_key = self._priv.decrypt(base64.b64decode(encrypt_random_key_b64), padding.PKCS1v15())
         slc = self._lib.NewSlice()
         try:
-            ret = self._lib.DecryptData(self._sdk, aes_key, encrypt_chat_msg.encode(), slc)
+            ret = self._lib.DecryptData(aes_key, encrypt_chat_msg.encode(), slc)
             if ret != 0:
                 raise WxFinanceError(f"DecryptData 失败 ret={ret}")
             return json.loads(self._slice_bytes(slc).decode("utf-8"))