diff --git a/llm/server/server/engine/infer.py b/llm/server/server/engine/infer.py
index 9b1db3d8f..f00cd0506 100644
--- a/llm/server/server/engine/infer.py
+++ b/llm/server/server/engine/infer.py
@@ -29,7 +29,7 @@ from paddlenlp.trl.llm_utils import get_rotary_position_embedding
 from paddlenlp_ops import step_paddle, speculate_step_paddle
 from server.data.processor import DataProcessor
 from server.engine.config import Config
-from server.engine.proposers import InferenceWithReferenceProposer
+from paddlenlp.experimental.transformers import InferenceWithReferenceProposer
 from server.utils import get_logger
 from task_queue_manager import TaskQueueManager
 
@@ -518,6 +518,7 @@ class ModelRunner:
             self.share_inputs['infer_seed'].add_(infer_seed_increment)
             self.share_inputs['infer_seed'][:] %= self.MAX_INFER_SEED
             if self.free_list_len > 0:
+                logger.info('You got into step CUDA!!!')
                 self.step_cuda(seq_lens_this_time)
 
 
diff --git a/llm/server/server/engine/proposers.py b/llm/server/server/engine/proposers.py
deleted file mode 100644
index f2a1d2b0a..000000000
--- a/llm/server/server/engine/proposers.py
+++ /dev/null
@@ -1,94 +0,0 @@
-# Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-from __future__ import annotations
-
-from abc import ABC, abstractmethod
-
-import paddle
-
-
-class Proposer(ABC):
-    """
-    Abstract base class for all proposers that can be used in the speculative decoding framework.
-    The subclasses of this class must implement the run method to get the draft tokens that are
-    generated by the proposer.
-    """
-
-    def __init__(self, **kwargs):
-        pass
-
-    @abstractmethod
-    def run(self, model_inputs: dict[str, paddle.Tensor], **kargs):
-        """
-        Get the draft tokens that are generated by the proposer.
-        """
-        raise NotImplementedError()
-
-
-class InferenceWithReferenceProposer(Proposer):
-    """
-    InferenceWithReference(https://arxiv.org/pdf/2304.04487) is one of the speculative decoding method.
-    It match tokens in the input and output as draft tokens.
-    """
-
-    def __init__(self, max_draft_token_num: int, max_ngram_size: int, max_batch_size: int, max_seq_len: int, **kwargs):
-        """
-        Args:
-        max_draft_token_num (int):
-            Maximum number of tokens a proposer can generate at one time.
-            The hyperparameter of k in the paper.
-        max_ngram_size (int):
-            The maximum size of the window used to match inputs and outputs.
-            The hyperparameter of n in the paper.
-        max_batch_size (int):
-            The maximum batch size.
-        max_seq_len (int):
-            The maximum sequence length.
-        """
-        super().__init__()
-        self.max_ngram_size = max_ngram_size
-        self.input_ids_len = paddle.zeros(shape=[max_batch_size, 1], dtype="int64").cpu()
-        self.input_ids_cpu = paddle.zeros(shape=[max_batch_size, max_seq_len], dtype="int64").cpu()
-        self.max_batch_size = max_batch_size
-        self.max_draft_token_num = max_draft_token_num
-
-    def run(self, model_inputs: dict[str, paddle.Tensor], **kargs):
-        """
-        Use ngram_match to get draft tokens from the input and output.
-        """
-        draft_tokens = model_inputs["draft_tokens"].cpu()
-        seq_lens_this_time = kargs["seq_lens_this_time"].cpu()
-        seq_lens_encoder = model_inputs["seq_lens_encoder"].cpu()
-        seq_lens_decoder = model_inputs["seq_lens_decoder"].cpu()
-
-        from paddlenlp_ops import ngram_match
-
-        ngram_match(
-            self.input_ids_cpu,
-            self.input_ids_len.cpu(),
-            model_inputs["pre_ids"].cpu(),
-            model_inputs["step_idx"].cpu(),
-            model_inputs["actual_draft_token_num"].cpu(),
-            draft_tokens,
-            seq_lens_this_time,
-            seq_lens_encoder,
-            seq_lens_decoder,
-            kargs["real_batch_size"],
-            self.max_ngram_size,
-            self.max_draft_token_num,
-        )
-
-        model_inputs["draft_tokens"][:] = draft_tokens.cuda()
-        model_inputs["seq_lens_encoder"][:] = seq_lens_encoder.cuda()
-        kargs["seq_lens_this_time"][:] = seq_lens_this_time.cuda()