diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index e95d43cae91f9613532868266533c258db9ec860..c9c657ab7229392cdd7da5d2a7fc0bce0c3b4b4a 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -8091,7 +8091,7 @@ def bilinear_tensor_product(x,
             If it is set to None, the bias is initialized zero. Default: None.
 
     Returns:
-        Variable: A 3-D Tensor of shape [N x M x P] with positional encoding.
+        Variable: A 2-D Tensor of shape [batch_size, size].
 
     Examples:
         .. code-block:: python