diff --git a/tools/infer/utility.py b/tools/infer/utility.py
index cad1a01736ee0d1df98923fb208c2734c964104c..04214016926442b88133f281c5712bda4c73285b 100755
--- a/tools/infer/utility.py
+++ b/tools/infer/utility.py
@@ -129,7 +129,8 @@ def create_predictor(args, mode, logger):
             #config.set_mkldnn_op({'conv2d', 'depthwise_conv2d', 'pool2d', 'batch_norm'})
             args.rec_batch_num = 1
 
-    # config.enable_memory_optim()
+    # enable memory optim
+    config.enable_memory_optim()
     config.disable_glog_info()
 
     config.delete_pass("conv_transpose_eltwiseadd_bn_fuse_pass")