diff --git a/vllm_ascend/attention/mla_v1.py b/vllm_ascend/attention/mla_v1.py
index 201250756a..223d78de76 100644
--- a/vllm_ascend/attention/mla_v1.py
+++ b/vllm_ascend/attention/mla_v1.py
@@ -543,9 +543,8 @@ def build(
                                                device=input_positions.device)
                 input_positions = torch.cat(
                     [input_positions, position_padding])
-                actual_seq_lengths_q = query_start_loc[1:].tolist(
-                ) + self.runner.actual_seq_lengths_q[num_reqs:num_reqs +
-                                                     num_reqs_pad_size]
+                actual_seq_lengths_q = actual_seq_lengths_q + self.runner.actual_seq_lengths_q[
+                    num_reqs:num_reqs + num_reqs_pad_size]
             else:
                 seq_lens_list = seq_lens.tolist()
             # mtp torchair + PD scenario, last element of actual_seq_lengths_q must equal to batch_size(num_tokens)
@@ -959,7 +958,6 @@ def _forward_decode(
                     AscendAttentionState.SpecDecoding,
                     AscendAttentionState.ChunkedPrefill
             ]:
-                assert num_tokens % (1 + self.spec_token_num) == 0
                 input_layout = "TND"
                 # [bs * q_seq_len, num_heads_per_rank, dim]
                 q_nope = q_nope.view(num_tokens, self.num_heads, -1)
diff --git a/vllm_ascend/worker/model_runner_v1.py b/vllm_ascend/worker/model_runner_v1.py
index 8803bc0cde..d300c1ead8 100644
--- a/vllm_ascend/worker/model_runner_v1.py
+++ b/vllm_ascend/worker/model_runner_v1.py
@@ -976,6 +976,9 @@ def _process_reqs(
         # We assume it is the decode stage, where prefill occurs but only one token is not hit in cache.
         elif np.all(num_scheduled_tokens == 1):
             attn_state = AscendAttentionState.DecodeOnly
+            if self.speculative_config and self.speculative_config.method == 'deepseek_mtp':
+                # support deepseek mtp spec decode in disaggregated-prefill scenario
+                attn_state = AscendAttentionState.SpecDecoding
         # Speculative decoding.
         elif np.all(num_valid_tokens == 1):
             attn_state = AscendAttentionState.SpecDecoding
diff --git a/vllm_ascend/worker/worker_v1.py b/vllm_ascend/worker/worker_v1.py
index 7a1d4d3d9d..2f3423c781 100644
--- a/vllm_ascend/worker/worker_v1.py
+++ b/vllm_ascend/worker/worker_v1.py
@@ -22,6 +22,7 @@
 import torch
 import torch.nn as nn
 import torch_npu
+from torch_npu.op_plugin.atb._atb_ops import _register_atb_extensions
 from vllm import envs
 from vllm.config import VllmConfig
 from vllm.distributed import (ensure_model_parallel_initialized,
@@ -69,6 +70,7 @@ def __init__(
         # Register ops when worker init.
         from vllm_ascend import ops
         ops.register_dummy_fusion_op()
+        _register_atb_extensions()
         # init ascend config
         init_ascend_config(vllm_config)