diff --git a/python/paddle/tensor/math.py b/python/paddle/tensor/math.py
index efd1746f91b4cecac37f94973bcc169c5872df78..98167ebc35babae3747efd0d8facb7aaea72e655 100644
--- a/python/paddle/tensor/math.py
+++ b/python/paddle/tensor/math.py
@@ -3561,7 +3561,7 @@ def lerp(x, y, weight, name=None):
             x = paddle.arange(1., 5., dtype='float32')
             y = paddle.empty([4], dtype='float32')
             y.fill_(10.)
-            out = paddle.lerp(start, end, 0.5)
+            out = paddle.lerp(x, y, 0.5)
             # out: [5.5., 6., 6.5, 7.]
 
     """