diff --git a/tests/onnx/onnxbase.py b/tests/onnx/onnxbase.py
index b5f9db718b8c8be7fe2d76c002cc04233029ee97..34954b4df1c0cb2d7c14a92af3b8140c1f44783d 100644
--- a/tests/onnx/onnxbase.py
+++ b/tests/onnx/onnxbase.py
@@ -60,7 +60,7 @@ def compare(result, expect, delta=1e-10, rtol=1e-10):
             result.shape, expect.shape)
         assert result.dtype == expect.dtype, "result.dtype: {} != expect.dtype: {}".format(
             result.dtype, expect.dtype)
-    elif isinstance(result, (list, tuple)) and len(result) > 1:
+    elif isinstance(result, (list, tuple)):
         for i in range(len(result)):
             if isinstance(result[i], (np.generic, np.ndarray)):
                 compare(result[i], expect[i], delta, rtol)
@@ -69,6 +69,8 @@ def compare(result, expect, delta=1e-10, rtol=1e-10):
     # deal with scalar tensor
     elif len(expect) == 1:
         compare(result, expect[0], delta, rtol)
+    else:
+        raise Exception("Compare diff wrong!!!!!!")
 
 
 def randtool(dtype, low, high, shape):