diff --git a/ppocr/data/lmdb_dataset.py b/ppocr/data/lmdb_dataset.py
index e1b49809d199096ad06b90c4562aa5dbfa634db1..2b1ccaddcea437acb3901d6b0391dd0c7b2954b7 100644
--- a/ppocr/data/lmdb_dataset.py
+++ b/ppocr/data/lmdb_dataset.py
@@ -37,6 +37,8 @@ class LMDBDataSet(Dataset):
         if self.do_shuffle:
             np.random.shuffle(self.data_idx_order_list)
         self.ops = create_operators(dataset_config['transforms'], global_config)
+        self.ext_op_transform_idx = dataset_config.get("ext_op_transform_idx",
+                                                       2)
 
         ratio_list = dataset_config.get("ratio_list", [1.0])
         self.need_reset = True in [x < 1 for x in ratio_list]
@@ -88,6 +90,29 @@ class LMDBDataSet(Dataset):
         if imgori is None:
             return None
         return imgori
+    
+    def get_ext_data(self):
+        ext_data_num = 0
+        for op in self.ops:
+            if hasattr(op, 'ext_data_num'):
+                ext_data_num = getattr(op, 'ext_data_num')
+                break
+        load_data_ops = self.ops[:self.ext_op_transform_idx]
+        ext_data = []
+        
+        while len(ext_data) < ext_data_num:
+            lmdb_idx, file_idx = self.data_idx_order_list[np.random.randint(self.__len__())]
+            lmdb_idx = int(lmdb_idx)
+            file_idx = int(file_idx)
+            sample_info = self.get_lmdb_sample_info(self.lmdb_sets[lmdb_idx]['txn'],
+                                                file_idx)
+            if sample_info is None:
+                continue
+            img, label = sample_info
+            data = {'image': img, 'label': label}
+            outs = transform(data, load_data_ops)
+            ext_data.append(data)
+        return ext_data
 
     def get_lmdb_sample_info(self, txn, index):
         label_key = 'label-%09d'.encode() % index
@@ -109,6 +134,7 @@ class LMDBDataSet(Dataset):
             return self.__getitem__(np.random.randint(self.__len__()))
         img, label = sample_info
         data = {'image': img, 'label': label}
+        data['ext_data'] = self.get_ext_data()
         outs = transform(data, self.ops)
         if outs is None:
             return self.__getitem__(np.random.randint(self.__len__()))