diff --git a/python/paddle/fluid/tests/unittests/seresnext_net.py b/python/paddle/fluid/tests/unittests/seresnext_net.py
index 5559fb7eab08b7155c280c8a4a6f83a65b585b78..c31471efbde84da1ea1b3141f344bbefda8134c2 100644
--- a/python/paddle/fluid/tests/unittests/seresnext_net.py
+++ b/python/paddle/fluid/tests/unittests/seresnext_net.py
@@ -173,7 +173,7 @@ model = SE_ResNeXt50Small
 
 
 def batch_size():
-    return 12
+    return 8
 
 
 def iter(use_cuda):