diff --git a/python/paddle/nn/functional/flash_attention.py b/python/paddle/nn/functional/flash_attention.py
index 50e79c1ad17f5c7945a6865dd00bf4a748e6faa8..7c9c1b201c89735da35095abb6710d95c389c536 100644
--- a/python/paddle/nn/functional/flash_attention.py
+++ b/python/paddle/nn/functional/flash_attention.py
@@ -81,7 +81,7 @@ def _math_attention(
 
 
 def _select_sdp_cuda(head_dim):
-    if head_dim < 128:
+    if head_dim <= 128:
         return "flash_attn"
     else:
         return "mem_efficient"