diff --git a/demo/ctr-dnn_train.yaml b/demo/ctr-dnn_train.yaml
index ecb7704422ce06fcb7e12565ffda0649dd556da4..8fd0c3f66c79122be1260dae5bf9a275727f398a 100644
--- a/demo/ctr-dnn_train.yaml
+++ b/demo/ctr-dnn_train.yaml
@@ -14,7 +14,6 @@
 
 train:
   trainer:
-    threads: 4
     # for cluster training
     strategy: "async"