diff --git a/tests/long_term/spec_decode_v1/test_v1_mtp_correctness.py b/tests/long_term/spec_decode_v1/test_v1_mtp_correctness.py
index 68736c0928..4e3fcad629 100644
--- a/tests/long_term/spec_decode_v1/test_v1_mtp_correctness.py
+++ b/tests/long_term/spec_decode_v1/test_v1_mtp_correctness.py
@@ -78,7 +78,12 @@ def test_mtp_correctness(
                        },
                        max_model_len=256,
                        gpu_memory_utilization=0.8,
-                       enforce_eager=True)
+                       enforce_eager=True,
+                       additional_config={
+                           "ascend_scheduler_config": {
+                               "enabled": True
+                           },
+                       })
         spec_outputs = spec_llm.chat(test_prompts, sampling_config)
         matches = 0
         misses = 0
diff --git a/tests/singlecard/core/test_ascend_scheduler_e2e.py b/tests/singlecard/core/test_ascend_scheduler_e2e.py
index 668dafced9..70272b3da5 100644
--- a/tests/singlecard/core/test_ascend_scheduler_e2e.py
+++ b/tests/singlecard/core/test_ascend_scheduler_e2e.py
@@ -18,6 +18,7 @@ def model() -> LLM:
         MODEL,
         enforce_eager=True,
         enable_prefix_caching=True,
+        max_model_len=200,
         max_num_batched_tokens=200,
         max_num_seqs=3,
         additional_config={"ascend_scheduler_config": {
diff --git a/vllm_ascend/ascend_config.py b/vllm_ascend/ascend_config.py
index 9d99a04cd8..499030b4b7 100644
--- a/vllm_ascend/ascend_config.py
+++ b/vllm_ascend/ascend_config.py
@@ -203,6 +203,13 @@ def check_ascend_config(vllm_config, enforce_eager):
                 "Ascend scheduler is only supported for V1 Engine.")
     # for v1 engine
     else:
+        # TODO(yexiong): remove this verification after mtp model supports original vllm scheduler
+        if (not ascend_config.ascend_scheduler_config.enabled
+                and vllm_config.speculative_config
+                and vllm_config.speculative_config.method == 'deepseek_mtp'):
+            raise NotImplementedError(
+                "Currently deepseek MTP model is only supported for ascend scheduler."
+            )
         # for eager mode
         if enforce_eager:
             # torchair_graph cannot be enabled with eager mode.
diff --git a/vllm_ascend/core/schedule_config.py b/vllm_ascend/core/schedule_config.py
index 4a4131ecd7..4ee02e7ed4 100644
--- a/vllm_ascend/core/schedule_config.py
+++ b/vllm_ascend/core/schedule_config.py
@@ -55,6 +55,16 @@ def __post_init__(self) -> None:
         self.max_num_encoder_input_tokens = self.max_num_batched_tokens
         self.encoder_cache_size = self.max_num_batched_tokens
         self.chunked_prefill_enabled = self.enable_chunked_prefill
+        if (self.max_num_batched_tokens < self.max_model_len
+                and not self.chunked_prefill_enabled):
+            raise ValueError(
+                "Ascend scheduler is enabled without chunked prefill feature. "
+                f"Argument max_num_batched_tokens ({self.max_num_batched_tokens}) is "
+                f"smaller than max_model_len ({self.max_model_len}). "
+                "This effectively limits the maximum sequence length to "
+                "max_num_batched_tokens and makes vLLM reject longer "
+                "sequences. Please increase max_num_batched_tokens or "
+                "decrease max_model_len.")
         if self.policy != "fcfs":
             raise NotImplementedError(
                 f"currently AscendScheduler only supports fcfs policy, got {self.policy}"
diff --git a/vllm_ascend/platform.py b/vllm_ascend/platform.py
index 8eab3a14aa..9792f54446 100644
--- a/vllm_ascend/platform.py
+++ b/vllm_ascend/platform.py
@@ -27,6 +27,7 @@
 from vllm.logger import logger
 from vllm.platforms import Platform, PlatformEnum
 
+import vllm_ascend.envs as envs_ascend
 from vllm_ascend.ascend_config import check_ascend_config, init_ascend_config
 from vllm_ascend.utils import (ASCEND_QUATIZATION_METHOD,
                                check_torchair_cache_exist,
@@ -147,6 +148,11 @@ def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
 
         check_ascend_config(vllm_config, enforce_eager)
 
+        if vllm_config.speculative_config and envs_ascend.VLLM_ASCEND_ENABLE_DBO:
+            raise ValueError(
+                "DBO and mtp can't work at the same time. Please `export VLLM_ASCEND_ENABLE_DBO=0`"
+            )
+
         if enforce_eager or compilation_config.level == CompilationLevel.NO_COMPILATION:
             logger.info("Compilation disabled, using eager mode by default")
             compilation_config.level = CompilationLevel.NO_COMPILATION
@@ -154,7 +160,7 @@ def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
             logger.warning(
                 "NPU does not support %s compilation level. Setting level to NO_COMPILATION",
                 compilation_config.level)
-            compilation_config.level = CompilationLevel.NO_COMPILATION
+            compilation_config.level = CompilationLevel.NfvO_COMPILATION
         elif ascend_config.torchair_graph_config.enabled:
             logger.info(
                 "Torchair compilation enabled on NPU. Setting level to NO_COMPILATION"
diff --git a/vllm_ascend/worker/model_runner_v1.py b/vllm_ascend/worker/model_runner_v1.py
index 347f9126a5..c622e47a9a 100644
--- a/vllm_ascend/worker/model_runner_v1.py
+++ b/vllm_ascend/worker/model_runner_v1.py
@@ -219,9 +219,6 @@ def __init__(self, vllm_config: VllmConfig, device: torch.device):
         self.spec_token_num = 0
         self.decode_token_per_req = 1
         if self.speculative_config:
-            if envs_ascend.VLLM_ASCEND_ENABLE_DBO:
-                raise NotImplementedError(
-                    "DBO and mtp can't work at the same currently")
             self.use_spec_decode = True
             self.spec_token_num = self.speculative_config.num_speculative_tokens
             assert self.spec_token_num > 0