diff --git a/paddlenlp/transformers/luke/tokenizer.py b/paddlenlp/transformers/luke/tokenizer.py
index 7653c96526c2..196dd7835d9e 100644
--- a/paddlenlp/transformers/luke/tokenizer.py
+++ b/paddlenlp/transformers/luke/tokenizer.py
@@ -608,7 +608,7 @@ def _convert_token_to_id_with_added_voc(self, token):
 
         return self._convert_token_to_id(token)
 
-    def add_special_tokens(self, token_list: Union[List[int], Dict]):
+    def add_special_tokens(self, token_list: Union[List[int], Dict], replace_additional_special_tokens: bool = True):
         """
         Adding special tokens if you need.
 
@@ -616,14 +616,36 @@ def add_special_tokens(self, token_list: Union[List[int], Dict]):
             token_list (List[int], Dict[List[int]]):
                 The special token list you provided. If you provide a Dict, the key of the Dict must
                 be "additional_special_tokens" and the value must be token list.
+            replace_additional_special_tokens (bool, optional, defaults to True):
+                If True, the existing list of additional special tokens will be replaced by the list provided in
+                `token_list`. Otherwise, `self._additional_special_tokens` is just extended. In the former
+                case, the tokens will NOT be removed from the tokenizer's full vocabulary - they are only being flagged
+                as non-special tokens. Remember, this only affects which tokens are skipped during decoding, not the
+                `added_tokens_encoder` and `added_tokens_decoder`. This means that the previous
+                `additional_special_tokens` are still added tokens, and will not be split by the model.
         """
         if isinstance(token_list, dict):
             token_list = token_list["additional_special_tokens"]
+
+        if not hasattr(self, "_additional_special_tokens"):
+            self._additional_special_tokens = []
+
+        if replace_additional_special_tokens:
+            self._additional_special_tokens = list(token_list)
+        else:
+            self._additional_special_tokens.extend(
+                [token for token in token_list if token not in self._additional_special_tokens]
+            )
         encoder_dict = dict()
         decoder_dict = dict()
-        for token in token_list:
-            encoder_dict[token] = len(self.encoder.keys())
-            decoder_dict[len(self.decoder.keys())] = token
+        current_encoder_length = len(self.encoder) + len(self.added_tokens_encoder)
+        current_decoder_length = len(self.decoder) + len(self.added_tokens_decoder)
+
+        for idx, token in enumerate(token_list):
+            if token not in self.added_tokens_encoder:
+                encoder_dict[token] = current_encoder_length + idx
+                decoder_dict[current_decoder_length + idx] = token
+
         self.added_tokens_encoder.update(encoder_dict)
         self.added_tokens_decoder.update(decoder_dict)
 
diff --git a/paddlenlp/transformers/tokenizer_utils_base.py b/paddlenlp/transformers/tokenizer_utils_base.py
index a731acaed2f6..6af5cc29e5d4 100644
--- a/paddlenlp/transformers/tokenizer_utils_base.py
+++ b/paddlenlp/transformers/tokenizer_utils_base.py
@@ -875,11 +875,9 @@ def add_special_tokens(
 
                 to_add = []
                 for token in value:
-                    if isinstance(token, str):
-                        # for legacy purpose we default to stripping. `test_add_tokens_tokenizer` depends on this
-                        token = AddedToken(token, rstrip=False, lstrip=False, normalized=False, special=True)
-                    if replace_additional_special_tokens or str(token) not in self.additional_special_tokens:
-                        to_add.append(token)
+                    if not replace_additional_special_tokens and str(token) in self.additional_special_tokens:
+                        continue
+                    to_add.append(token)
                 if replace_additional_special_tokens and len(to_add) > 0:
                     setattr(self, key, list(to_add))
                 else:
@@ -889,11 +887,7 @@ def add_special_tokens(
             else:
                 if not isinstance(value, (str, AddedToken)):
                     raise ValueError(f"Token {value} for key {key} should be a str or an AddedToken instance")
-                if isinstance(value, (str)):
-                    # for legacy purpose we default to stripping. `False` depends on this
-                    value = AddedToken(value, rstrip=False, lstrip=False, normalized=False, special=True)
-                if isinstance(value, AddedToken):
-                    setattr(self, key, value)
+                setattr(self, key, value)
                 if value not in added_tokens:
                     added_tokens.append(value)
 
diff --git a/tests/transformers/test_tokenizer_common.py b/tests/transformers/test_tokenizer_common.py
index 7c8514eeea5e..7d78bfb09e0f 100644
--- a/tests/transformers/test_tokenizer_common.py
+++ b/tests/transformers/test_tokenizer_common.py
@@ -1155,6 +1155,7 @@ def test_maximum_encoding_length_pair_input(self):
     #             encoded_masked[mask_loc] = encoded_1[mask_loc]
 
     #             self.assertEqual(encoded_masked, encoded_1)
+
     def test_special_token_addition(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
@@ -1180,7 +1181,6 @@ def test_special_token_addition(self):
                     )
                     self.assertEqual(tokenizer_2.additional_special_tokens, ["<other>", "<another>", "<tok>"])
 
-
     def test_special_tokens_mask(self):
         tokenizers = self.get_tokenizers(do_lower_case=False)
         for tokenizer in tokenizers: