diff --git a/python/paddle/v2/fluid/layers/nn.py b/python/paddle/v2/fluid/layers/nn.py
index 7feb479d2e3bc396eac53045888175ba54864b66..180a760150b19bee201b9e2cc6cb91dda2cf1f2a 100644
--- a/python/paddle/v2/fluid/layers/nn.py
+++ b/python/paddle/v2/fluid/layers/nn.py
@@ -816,6 +816,11 @@ def sequence_pool(input, pool_type, **kwargs):
                  "MaxIndex": max_index},
         attrs={"pooltype": pool_type.upper()})
 
+    # when pool_type is max, variable max_index is initialized,
+    # so we stop the gradient explicitly here
+    if pool_type == 'max':
+        max_index.stop_gradient = True
+
     return pool_out