diff --git a/tests/e2e/accuracy/test_hunyuan_image3_pixel_accuracy.py b/tests/e2e/accuracy/test_hunyuan_image3_pixel_accuracy.py
index 6ac930f46..3f799c038 100644
--- a/tests/e2e/accuracy/test_hunyuan_image3_pixel_accuracy.py
+++ b/tests/e2e/accuracy/test_hunyuan_image3_pixel_accuracy.py
@@ -48,6 +48,7 @@ _DEPLOY_CONFIG = {
             "trust_remote_code": True,
             "devices": "0,1,2,3",  # set dynamically by _write_deploy_config
             "vae_use_slicing": False,
+            "moe_backend": "flashinfer_cutlass",
             "vae_use_tiling": False,
             "parallel_config": {
                 "pipeline_parallel_size": 1,
diff --git a/vllm_omni/config/omni_config.py b/vllm_omni/config/omni_config.py
index dc5f4ef9c..256dcd5c7 100644
--- a/vllm_omni/config/omni_config.py
+++ b/vllm_omni/config/omni_config.py
@@ -469,6 +469,7 @@ class _DiffusionConfigProjection:
     diffusion_kv_cache_skip_layers: str | list[int] | tuple[int, ...] | set[int] | None = None
     diffusion_kv_cache_skip_step_indices: set[int] | None = None
     diffusion_kv_cache_skip_layer_indices: set[int] | None = None
+    moe_backend: str = "auto"
     force_cutlass_fp8: bool = False
     enable_diffusion_pipeline_profiler: bool = False
     step_execution: bool = False
diff --git a/vllm_omni/diffusion/data.py b/vllm_omni/diffusion/data.py
index 0feab5b28..e131b833b 100644
--- a/vllm_omni/diffusion/data.py
+++ b/vllm_omni/diffusion/data.py
@@ -664,6 +664,9 @@ class OmniDiffusionConfig:
     # STA_mode: STA_Mode = STA_Mode.STA_INFERENCE
     skip_time_steps: int = 15
 
+    # MoE kernel backend selection
+    moe_backend: str = "auto"
+
     # Compilation
     enforce_eager: bool = False
 
diff --git a/vllm_omni/diffusion/worker/diffusion_worker.py b/vllm_omni/diffusion/worker/diffusion_worker.py
index 8cce47897..006bbae48 100644
--- a/vllm_omni/diffusion/worker/diffusion_worker.py
+++ b/vllm_omni/diffusion/worker/diffusion_worker.py
@@ -288,6 +288,12 @@ class DiffusionWorker:
         # Since vLLM v0.20.0, IR wraps GPU ops. Set IR op priority preference to enforce GPU op fusion during wrapping.
         # Also need to log, because vLLM internally logs another line in VllmConfig.__post_init__. Avoid confusion.
         vllm_config.kernel_config.ir_op_priority = _resolve_ir_op_priority(self.od_config, vllm_config)
+        if self.od_config.moe_backend != "auto":
+            logger.warning(
+                "Overriding MoE backend from default 'auto' to '%s' per deploy config.",
+                self.od_config.moe_backend,
+            )
+            vllm_config.kernel_config.moe_backend = self.od_config.moe_backend
         logger.info(
             "Final IR op priority after setting vLLM-Omni overrides: %s", vllm_config.kernel_config.ir_op_priority
         )