diff --git a/tools/static/train.py b/tools/static/train.py
index cd6aaefaa0eb11f0983057831e54f9eb95b02fa5..12894b67bce3c0dabf5802a5b5ceba9bad063b23 100644
--- a/tools/static/train.py
+++ b/tools/static/train.py
@@ -72,7 +72,7 @@ def main(args):
     if use_amp or use_pure_fp16:
         AMP_RELATED_FLAGS_SETTING = {
             'FLAGS_cudnn_exhaustive_search': 1,
-            'FLAGS_conv_workspace_size_limit': 4000,
+            'FLAGS_conv_workspace_size_limit': 1500,
             'FLAGS_cudnn_batchnorm_spatial_persistent': 1,
             'FLAGS_max_inplace_grad_add': 8,
         }