diff --git a/configs/det/ch_PP-OCRv2/ch_PP-OCRv2_det_dml.yml b/configs/det/ch_PP-OCRv2/ch_PP-OCRv2_det_dml.yml
index f3ad966488dbc2f6f7ca12033bc4a3d35e1b3bd7..8b160f63538d51dc57b08ba83f7ebf019e3c9dbb 100644
--- a/configs/det/ch_PP-OCRv2/ch_PP-OCRv2_det_dml.yml
+++ b/configs/det/ch_PP-OCRv2/ch_PP-OCRv2_det_dml.yml
@@ -65,7 +65,7 @@ Loss:
       - ["Student", "Teacher"]
       maps_name: "thrink_maps"
       weight: 1.0
-      act: "softmax"
+      # act: None
       model_name_pairs: ["Student", "Teacher"]
       key: maps
   - DistillationDBLoss: