diff --git a/mindnlp/core/_dtype.py b/mindnlp/core/_dtype.py
index 0f526e731..73aa3c973 100644
--- a/mindnlp/core/_dtype.py
+++ b/mindnlp/core/_dtype.py
@@ -22,15 +22,15 @@
 dtype = Type
 
 @property
-def is_floating_point(self):
+def _is_floating_point(self):
     return isinstance(self, (typing.Float, typing.BFloat))
 
 @property
-def is_complex(self):
+def _is_complex(self):
     return isinstance(self, typing.Complex)
 
-Type.is_floating_point = is_floating_point
-Type.is_complex = is_complex
+Type.is_floating_point = _is_floating_point
+Type.is_complex = _is_complex
 Type.__str__ = Type.__repr__
 
 
diff --git a/mindnlp/core/ops/tensor.py b/mindnlp/core/ops/tensor.py
index 0b44f0150..eefcf3f16 100644
--- a/mindnlp/core/ops/tensor.py
+++ b/mindnlp/core/ops/tensor.py
@@ -16,4 +16,7 @@ def numel(input):
 def as_tensor(data, dtype=None, **kwarg):
     return core.tensor(data, dtype=dtype)
 
-__all__ = ['as_tensor', 'is_floating_point', 'is_tensor', 'numel']
\ No newline at end of file
+def is_complex(input):
+    return input.dtype.is_complex
+
+__all__ = ['as_tensor', 'is_floating_point', 'is_tensor', 'numel', 'is_complex']
\ No newline at end of file