diff --git a/python/paddle/fluid/contrib/mixed_precision/fp16_lists.py b/python/paddle/fluid/contrib/mixed_precision/fp16_lists.py
index 2913d99ee6b217c64b5ed0fdec76ada3fbe90aa2..5cfa77b3d9a4f8a0ea5a74c8746d51fb8312c72f 100644
--- a/python/paddle/fluid/contrib/mixed_precision/fp16_lists.py
+++ b/python/paddle/fluid/contrib/mixed_precision/fp16_lists.py
@@ -146,6 +146,8 @@ gray_list = {
     'cast',
     'fused_bn_add_activation',
     'c_identity',
+    'c_concat',
+    'c_allreduce_sum',
 }
 
 # The set of ops that don't support fp16 calculation