diff --git a/ppocr/losses/distillation_loss.py b/ppocr/losses/distillation_loss.py
index 1c5d8a2b5ad05b6748bfccb1836aca012d523080..b19f3f892da41d7155033680cc911eab90a7ec2b 100644
--- a/ppocr/losses/distillation_loss.py
+++ b/ppocr/losses/distillation_loss.py
@@ -34,7 +34,8 @@ def _sum_loss(loss_dict):
                 loss_dict["loss"] += value
         return loss_dict
 
-# class DistillationDMLLoss(DMLLoss):
+
+class DistillationDMLLoss(DMLLoss):
     """
     """
 
@@ -131,93 +132,6 @@ class DistillationCTCLoss(CTCLoss):
         return loss_dict
 
 
-"""
-class DistillationDBLoss(DBLoss):
-    def __init__(self,
-                 model_name_list=[],
-                 balance_loss=True,
-                 main_loss_type='DiceLoss',
-                 alpha=5,
-                 beta=10,
-                 ohem_ratio=3,
-                 eps=1e-6,
-                 name="db_loss",
-                 **kwargs):
-        super().__init__()
-        self.model_name_list = model_name_list
-        self.name = name
-
-    def forward(self, predicts, batch):
-        loss_dict = dict()
-        for idx, model_name in enumerate(self.model_name_list):
-            out = predicts[model_name]
-            if self.key is not None:
-                out = out[self.key]
-
-            loss = super().forward(out, batch)
-
-            if isinstance(loss, dict):
-                for key in loss.keys():
-                    if key == "loss":
-                        continue
-                    loss_dict[f"{self.name}_{model_name}_{key}"] = loss[key]
-            else:
-                loss_dict[f"{self.name}_{model_name}"] = loss
-
-        loss_dict = _sum_loss(loss_dict)
-        return loss_dict
-
-
-class DistillationDilaDBLoss(DBLoss):
-    def __init__(self, model_name_pairs=[],
-                 balance_loss=True,
-                 main_loss_type='DiceLoss',
-                 alpha=5,
-                 beta=10,
-                 ohem_ratio=3,
-                 eps=1e-6,
-                 name="dila_dbloss"):
-        super().__init__()
-        self.model_name_pairs = model_name_pairs
-        self.name = name
-
-    def forward(self, predicts, batch):
-        loss_dict = dict()
-        for idx, pair in enumerate(self.model_name_pairs):
-            stu_outs = predicts[pair[0]]
-            tch_outs = predicts[pair[1]]
-            if self.key is not None:
-                stu_preds = stu_outs[self.key]
-                tch_preds = tch_outs[self.key]
-            
-            stu_shrink_maps = stu_preds[:, 0, :, :]
-            stu_binary_maps = stu_preds[:, 2, :, :]
-
-            # dilation to teacher prediction
-            dilation_w = np.array([[1,1], [1,1]])
-            th_shrink_maps = tch_preds[:, 0, :, :] 
-            th_shrink_maps = th_shrink_maps.numpy() > 0.3 # thresh = 0.3 
-            dilate_maps = np.zeros_like(th_shrink_maps).astype(np.float32)
-            for i in range(th_shrink_maps.shape[0]):
-                dilate_maps[i] = cv2.dilate(th_shrink_maps[i, :, :].astype(np.uint8), dilation_w)
-            th_shrink_maps = paddle.to_tensor(dilate_maps)
-
-            label_threshold_map, label_threshold_mask, label_shrink_map, label_shrink_mask = batch[1:]
-            
-            # calculate the shrink map loss
-            bce_loss = self.alpha * self.bce_loss(stu_shrink_maps, th_shrink_maps,
-                                         label_shrink_mask)
-            loss_binary_maps = self.dice_loss(stu_binary_maps, th_shrink_maps,
-                                            label_shrink_mask)
-            
-            k = f"{self.name}_{pair[0]}_{pair[1]}"
-            loss_dict[k] = bce_loss + loss_binary_maps
-        
-        loss_dict = _sum_loss(loss_dict)
-        return loss
-"""
-
-
 class DistillationDistanceLoss(DistanceLoss):
     """
     """