diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index bdbb6c47e257ed3dcbc081a00cc39a41c2fee741..283d3c4b2a9b6e7840e7ecc967b62a027d8bed2a 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -4210,8 +4210,8 @@ def lrn(input, n=5, k=1.0, alpha=1e-4, beta=0.75, name=None):
 
     .. math::
 
-        Output(i, x, y) = Input(i, x, y) / \left(
-        k + \alpha \sum\limits^{\min(C, c + n/2)}_{j = \max(0, c - n/2)}
+        Output(i, x, y) = Input(i, x, y) / \left( \\
+        k + \alpha \sum\limits^{\min(C, c + n/2)}_{j = \max(0, c - n/2)} \\
         (Input(j, x, y))^2\right)^{\beta}
 
     In the above equation: