diff --git a/ppdet/modeling/target_assigners.py b/ppdet/modeling/target_assigners.py
index 03755762df22c9707c0a15202561ed4cb145a0f4..57d7bd738d2ee730effa3406df04fddedf1e5cd8 100644
--- a/ppdet/modeling/target_assigners.py
+++ b/ppdet/modeling/target_assigners.py
@@ -51,7 +51,7 @@ class CascadeBBoxAssigner(object):
 
         curr_bbox_reg_w = [
             1. / self.bbox_reg_weights[curr_stage],
-            2. / self.bbox_reg_weights[curr_stage],
+            1. / self.bbox_reg_weights[curr_stage],
             2. / self.bbox_reg_weights[curr_stage],
             2. / self.bbox_reg_weights[curr_stage],
         ]