diff --git a/ppocr/losses/det_db_loss.py b/ppocr/losses/det_db_loss.py
index f170f673..3e2aa063 100755
--- a/ppocr/losses/det_db_loss.py
+++ b/ppocr/losses/det_db_loss.py
@@ -47,6 +47,7 @@ class DBLoss(nn.Layer):
             negative_ratio=ohem_ratio)
 
     def forward(self, predicts, labels):
+        predicts = predicts['maps']
         label_threshold_map, label_threshold_mask, label_shrink_map, label_shrink_mask = labels[
             1:]
         shrink_maps = predicts[:, 0, :, :]
diff --git a/ppocr/modeling/heads/det_db_head.py b/ppocr/modeling/heads/det_db_head.py
index 49c50ffd..ca18d74a 100644
--- a/ppocr/modeling/heads/det_db_head.py
+++ b/ppocr/modeling/heads/det_db_head.py
@@ -120,9 +120,9 @@ class DBHead(nn.Layer):
     def forward(self, x):
         shrink_maps = self.binarize(x)
         if not self.training:
-            return shrink_maps
+            return {'maps': shrink_maps}
 
         threshold_maps = self.thresh(x)
         binary_maps = self.step_function(shrink_maps, threshold_maps)
         y = paddle.concat([shrink_maps, threshold_maps, binary_maps], axis=1)
-        return y
+        return {'maps': y}
diff --git a/ppocr/postprocess/db_postprocess.py b/ppocr/postprocess/db_postprocess.py
index 16c789dc..91729e0a 100755
--- a/ppocr/postprocess/db_postprocess.py
+++ b/ppocr/postprocess/db_postprocess.py
@@ -40,7 +40,8 @@ class DBPostProcess(object):
         self.max_candidates = max_candidates
         self.unclip_ratio = unclip_ratio
         self.min_size = 3
-        self.dilation_kernel = None if not use_dilation else np.array([[1, 1], [1, 1]])
+        self.dilation_kernel = None if not use_dilation else np.array(
+            [[1, 1], [1, 1]])
 
     def boxes_from_bitmap(self, pred, _bitmap, dest_width, dest_height):
         '''
@@ -132,7 +133,8 @@ class DBPostProcess(object):
         cv2.fillPoly(mask, box.reshape(1, -1, 2).astype(np.int32), 1)
         return cv2.mean(bitmap[ymin:ymax + 1, xmin:xmax + 1], mask)[0]
 
-    def __call__(self, pred, shape_list):
+    def __call__(self, outs_dict, shape_list):
+        pred = outs_dict['maps']
         if isinstance(pred, paddle.Tensor):
             pred = pred.numpy()
         pred = pred[:, 0, :, :]
diff --git a/tools/infer/predict_det.py b/tools/infer/predict_det.py
index d389ca39..b2260662 100755
--- a/tools/infer/predict_det.py
+++ b/tools/infer/predict_det.py
@@ -65,12 +65,12 @@ class TextDetector(object):
             postprocess_params["unclip_ratio"] = args.det_db_unclip_ratio
             postprocess_params["use_dilation"] = True
         elif self.det_algorithm == "EAST":
-            postprocess_params['name'] = 'EASTPostProcess'      
+            postprocess_params['name'] = 'EASTPostProcess'
             postprocess_params["score_thresh"] = args.det_east_score_thresh
             postprocess_params["cover_thresh"] = args.det_east_cover_thresh
             postprocess_params["nms_thresh"] = args.det_east_nms_thresh
         elif self.det_algorithm == "SAST":
-            postprocess_params['name'] = 'SASTPostProcess'      
+            postprocess_params['name'] = 'SASTPostProcess'
             postprocess_params["score_thresh"] = args.det_sast_score_thresh
             postprocess_params["nms_thresh"] = args.det_sast_nms_thresh
             self.det_sast_polygon = args.det_sast_polygon
@@ -178,7 +178,7 @@ class TextDetector(object):
             preds['f_tco'] = outputs[2]
             preds['f_tvo'] = outputs[3]
         else:
-            preds = outputs[0]
+            preds['maps'] = outputs[0]
 
         post_result = self.postprocess_op(preds, shape_list)
         dt_boxes = post_result[0]['points']