diff --git a/pyproject.toml b/pyproject.toml
index e49aa6e325..dbcef129ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -178,6 +178,7 @@ markers = [
     "xpu: Tests that run on XPU (auto-added)",
     "npu: Tests that run on NPU/Ascend (auto-added)",
     "musa: Tests that run on MUSA/Moore Threads (auto-added)",
+    "maca: Tests that run on MACA/MetaX (auto-added)",
     # specified computation resources marks (auto-added)
     "H100: Tests that require H100 GPU",
     "L4: Tests that require L4 GPU",
@@ -190,11 +191,13 @@ markers = [
     "distributed_xpu: Tests that require multi cards on XPU platform",
     "distributed_npu: Tests that require multi cards on NPU platform",
     "distributed_musa: Tests that require multi cards on MUSA platform",
+    "distributed_maca: Tests that require multi cards on MACA/MetaX platform",
     "skipif_cuda: Skip if the num of CUDA cards is less than the required",
     "skipif_rocm: Skip if the num of ROCm cards is less than the required",
     "skipif_xpu: Skip if the num of XPU cards is less than the required",
     "skipif_npu: Skip if the num of NPU cards is less than the required",
     "skipif_musa: Skip if the num of MUSA cards is less than the required",
+    "skipif_maca: Skip if the num of MACA cards is less than the required",
     # more detailed markers
     "slow: Slow tests (may skip in quick CI)",
     "benchmark: Benchmark tests",
diff --git a/requirements/maca.txt b/requirements/maca.txt
new file mode 100644
index 0000000000..8c4ff1c500
--- /dev/null
+++ b/requirements/maca.txt
@@ -0,0 +1,4 @@
+-r common.txt
+# MetaX MACA: install matching `vllm` + `vllm-metax` wheels or from source per
+# https://github.com/MetaX-MACA/vLLM-metax — not published as a single PyPI extra here.
+onnxruntime>=1.23.2
diff --git a/setup.py b/setup.py
index 057212d67f..8a2a92d17b 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,9 @@
 
 This setup.py implements platform-aware dependency routing so users can run
 `pip install vllm-omni` and automatically receive the correct platform-specific
-dependencies (CUDA/ROCm/CPU/XPU/NPU/MUSA) without requiring extras like `[cuda]`.
+dependencies (CUDA/ROCm/CPU/XPU/NPU/MUSA/MACA) without requiring extras like `[cuda]`.
+
+Optional PyPI vLLM pin (CUDA): ``pip install -e ".[vllm-upstream]"`` (see pyproject.toml).
 """
 
 import os
@@ -46,16 +48,16 @@ def detect_target_device() -> str:
 
     Priority order:
     1. VLLM_OMNI_TARGET_DEVICE environment variable (highest priority)
-    2. Torch backend detection (cuda, rocm, npu, xpu, musa)
+    2. Torch backend detection (maca, cuda, rocm, npu, xpu, musa)
     3. CPU fallback (default)
 
     Returns:
-        str: Device name ('cuda', 'rocm', 'npu', 'xpu', 'musa', or 'cpu')
+        str: Device name ('cuda', 'rocm', 'npu', 'xpu', 'musa', 'maca', or 'cpu')
     """
     # Priority 1: Explicit override via environment variable
     target_device = os.environ.get("VLLM_OMNI_TARGET_DEVICE")
     if target_device:
-        valid_devices = ["cuda", "rocm", "npu", "xpu", "musa", "cpu"]
+        valid_devices = ["cuda", "rocm", "npu", "xpu", "musa", "maca", "cpu"]
         if target_device.lower() in valid_devices:
             print(f"Using target device from VLLM_OMNI_TARGET_DEVICE: {target_device.lower()}")
             return target_device.lower()
@@ -68,7 +70,17 @@ def detect_target_device() -> str:
     try:
         import torch
 
-        # Check for CUDA
+        # MACA (MetaX): mcPyTorch may set torch.version.cuda; detect before generic CUDA.
+        try:
+            import vllm_metax  # noqa: F401
+        except ImportError:
+            pass
+        else:
+            if torch.cuda.is_available():
+                print("Detected MACA (MetaX) backend from vllm-metax")
+                return "maca"
+
+        # Check for CUDA (NVIDIA)
         if torch.version.cuda is not None:
             print("Detected CUDA backend from torch")
             return "cuda"
@@ -163,6 +175,8 @@ def get_vllm_omni_version() -> str:
             version += f"{sep}xpu"
         elif device == "musa":
             version += f"{sep}musa"
+        elif device == "maca":
+            version += f"{sep}maca"
         elif device == "cpu":
             version += f"{sep}cpu"
         else:
diff --git a/vllm_omni/diffusion/attention/backends/abstract.py b/vllm_omni/diffusion/attention/backends/abstract.py
index 472fde422d..20c3a17eb8 100644
--- a/vllm_omni/diffusion/attention/backends/abstract.py
+++ b/vllm_omni/diffusion/attention/backends/abstract.py
@@ -95,6 +95,8 @@ def forward(
             return self.forward_hip(query, key, value, attn_metadata)
         elif current_omni_platform.is_cuda():
             return self.forward_cuda(query, key, value, attn_metadata)
+        elif current_omni_platform.is_maca():
+            return self.forward_maca(query, key, value, attn_metadata)
         elif current_omni_platform.is_npu():
             return self.forward_npu(query, key, value, attn_metadata)
         elif current_omni_platform.is_xpu():
@@ -150,3 +152,13 @@ def forward_musa(
     ) -> torch.Tensor:
         # By default, MUSA ops are compatible with CUDA ops.
         return self.forward_cuda(query, key, value, attn_metadata)
+
+    def forward_maca(
+        self,
+        query: torch.Tensor,
+        key: torch.Tensor,
+        value: torch.Tensor,
+        attn_metadata: T | None = None,
+    ) -> torch.Tensor:
+        # MetaX MACA uses the CUDA-compatible runtime (vLLM-metax).
+        return self.forward_cuda(query, key, value, attn_metadata)
diff --git a/vllm_omni/diffusion/layers/custom_op.py b/vllm_omni/diffusion/layers/custom_op.py
index 27e3bce1f2..6fa1acd6fb 100644
--- a/vllm_omni/diffusion/layers/custom_op.py
+++ b/vllm_omni/diffusion/layers/custom_op.py
@@ -21,6 +21,8 @@ def dispatch_forward(self) -> Callable:
             return self.forward_hip
         elif current_omni_platform.is_cuda():
             return self.forward_cuda
+        elif current_omni_platform.is_maca():
+            return self.forward_maca
         elif current_omni_platform.is_npu():
             return self.forward_npu
         elif current_omni_platform.is_xpu():
@@ -57,3 +59,7 @@ def forward_hip(self, *args, **kwargs):
     def forward_musa(self, *args, **kwargs):
         # By default, we assume that MUSA ops are compatible with CUDA ops.
         return self.forward_cuda(*args, **kwargs)
+
+    def forward_maca(self, *args, **kwargs):
+        # MetaX MACA uses the CUDA-compatible runtime (vLLM-metax).
+        return self.forward_cuda(*args, **kwargs)
diff --git a/vllm_omni/platforms/__init__.py b/vllm_omni/platforms/__init__.py
index 64a7cdb16f..ba96740ca2 100644
--- a/vllm_omni/platforms/__init__.py
+++ b/vllm_omni/platforms/__init__.py
@@ -121,12 +121,37 @@ def musa_omni_platform_plugin() -> str | None:
     return "vllm_omni.platforms.musa.platform.MUSAOmniPlatform" if is_musa else None
 
 
+def maca_omni_platform_plugin() -> str | None:
+    """Check if MACA (MetaX) OmniPlatform should be activated.
+
+    Requires vLLM-metax and a CUDA-compatible torch runtime. If multiple Omni
+    platform plugins match, set ``VLLM_OMNI_TARGET_DEVICE`` (or adjust the
+    environment) so only one activates.
+    """
+    logger.debug("Checking if MACA OmniPlatform is available.")
+    try:
+        import torch
+    except Exception as e:
+        logger.debug("MACA OmniPlatform is not available because: %s", str(e))
+        return None
+    try:
+        import vllm_metax  # noqa: F401
+    except ImportError:
+        return None
+    if not torch.cuda.is_available():
+        logger.debug("MACA OmniPlatform is not available: CUDA runtime not available.")
+        return None
+    logger.debug("Confirmed MACA OmniPlatform is available.")
+    return "vllm_omni.platforms.maca.platform.MacaOmniPlatform"
+
+
 builtin_omni_platform_plugins = {
     "cuda": cuda_omni_platform_plugin,
     "rocm": rocm_omni_platform_plugin,
     "npu": npu_omni_platform_plugin,
     "xpu": xpu_omni_platform_plugin,
     "musa": musa_omni_platform_plugin,
+    "maca": maca_omni_platform_plugin,
 }
 
 
diff --git a/vllm_omni/platforms/interface.py b/vllm_omni/platforms/interface.py
index 8f1e66747d..e579e21720 100644
--- a/vllm_omni/platforms/interface.py
+++ b/vllm_omni/platforms/interface.py
@@ -20,6 +20,7 @@ class OmniPlatformEnum(Enum):
     NPU = "npu"
     XPU = "xpu"
     MUSA = "musa"
+    MACA = "maca"
     UNSPECIFIED = "unspecified"
 
 
@@ -49,6 +50,9 @@ def is_rocm(self) -> bool:
     def is_musa(self) -> bool:
         return self._omni_enum == OmniPlatformEnum.MUSA
 
+    def is_maca(self) -> bool:
+        return self._omni_enum == OmniPlatformEnum.MACA
+
     @classmethod
     def get_omni_ar_worker_cls(cls) -> str:
         raise NotImplementedError
diff --git a/vllm_omni/platforms/maca/__init__.py b/vllm_omni/platforms/maca/__init__.py
new file mode 100644
index 0000000000..d2fbc9f4ef
--- /dev/null
+++ b/vllm_omni/platforms/maca/__init__.py
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+from vllm_omni.platforms.maca.platform import MacaOmniPlatform
+
+__all__ = ["MacaOmniPlatform"]
diff --git a/vllm_omni/platforms/maca/platform.py b/vllm_omni/platforms/maca/platform.py
new file mode 100644
index 0000000000..6a6f2b71da
--- /dev/null
+++ b/vllm_omni/platforms/maca/platform.py
@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import torch
+from vllm.logger import init_logger
+from vllm.utils.torch_utils import cuda_device_count_stateless
+from vllm_metax.platform import MacaPlatform as MacaPlatformBase
+
+from vllm_omni.diffusion.attention.backends.registry import DiffusionAttentionBackendEnum
+from vllm_omni.diffusion.envs import PACKAGES_CHECKER
+from vllm_omni.platforms.interface import OmniPlatform, OmniPlatformEnum
+
+logger = init_logger(__name__)
+
+
+class MacaOmniPlatform(OmniPlatform, MacaPlatformBase):
+    """MetaX MACA implementation of OmniPlatform.
+
+    Inherits MACA-specific behavior from vLLM-metax and adds Omni worker / diffusion hooks.
+    """
+
+    _omni_enum = OmniPlatformEnum.MACA
+
+    @classmethod
+    def get_omni_ar_worker_cls(cls) -> str:
+        return "vllm_omni.platforms.maca.worker.maca_ar_worker.MacaARWorker"
+
+    @classmethod
+    def get_omni_generation_worker_cls(cls) -> str:
+        return "vllm_omni.platforms.maca.worker.maca_generation_worker.MacaGenerationWorker"
+
+    @classmethod
+    def get_default_stage_config_path(cls) -> str:
+        return "vllm_omni/model_executor/stage_configs"
+
+    @classmethod
+    def get_diffusion_model_impl_qualname(cls, op_name: str) -> str:
+        if op_name == "hunyuan_fused_moe":
+            return "vllm_omni.diffusion.models.hunyuan_image_3.hunyuan_fused_moe.HunyuanFusedMoEDefault"
+        return super().get_diffusion_model_impl_qualname(op_name)
+
+    @classmethod
+    def get_diffusion_attn_backend_cls(
+        cls,
+        selected_backend: str | None,
+        head_size: int,
+    ) -> str:
+        """Diffusion attention backend selection (CUDA-compatible path, like CudaOmniPlatform)."""
+
+        compute_capability = cls.get_device_capability()
+        compute_supported = False
+        if compute_capability is not None:
+            major, minor = compute_capability
+            capability = major * 10 + minor
+            compute_supported = 80 <= capability < 100
+
+        packages_info = PACKAGES_CHECKER.get_packages_info()
+        packages_available = packages_info.get("has_flash_attn", False)
+        flash_attn_supported = compute_supported and packages_available
+
+        if selected_backend is not None:
+            backend_upper = selected_backend.upper()
+            if backend_upper == "FLASH_ATTN" and not flash_attn_supported:
+                if not compute_supported:
+                    logger.warning(
+                        "Flash Attention expects compute capability >= 8.0 and < 10.0. "
+                        "Falling back to TORCH_SDPA backend."
+                    )
+                elif not packages_available:
+                    logger.warning("Flash Attention packages not available. Falling back to TORCH_SDPA backend.")
+                logger.info("Defaulting to diffusion attention backend SDPA")
+                return DiffusionAttentionBackendEnum.TORCH_SDPA.get_path()
+            backend = DiffusionAttentionBackendEnum[backend_upper]
+            logger.info("Using diffusion attention backend '%s'", backend_upper)
+            return backend.get_path()
+
+        if flash_attn_supported:
+            logger.info("Defaulting to diffusion attention backend FLASH_ATTN")
+            return DiffusionAttentionBackendEnum.FLASH_ATTN.get_path()
+
+        logger.info("Defaulting to diffusion attention backend SDPA")
+        return DiffusionAttentionBackendEnum.TORCH_SDPA.get_path()
+
+    @classmethod
+    def supports_torch_inductor(cls) -> bool:
+        # vLLM-metax currently disables generic Triton kernel paths; keep inductor off by default.
+        return False
+
+    @classmethod
+    def get_torch_device(cls, local_rank: int | None = None) -> torch.device:
+        if local_rank is None:
+            return torch.device("cuda")
+        return torch.device("cuda", local_rank)
+
+    @classmethod
+    def get_device_count(cls) -> int:
+        return cuda_device_count_stateless()
+
+    @classmethod
+    def get_device_version(cls) -> str | None:
+        return torch.version.cuda
+
+    @classmethod
+    def synchronize(cls) -> None:
+        torch.cuda.synchronize()
+
+    @classmethod
+    def get_free_memory(cls, device: torch.device | None = None) -> int:
+        free, _ = torch.cuda.mem_get_info(device)
+        return free
diff --git a/vllm_omni/platforms/maca/worker/__init__.py b/vllm_omni/platforms/maca/worker/__init__.py
new file mode 100644
index 0000000000..ba40deefb2
--- /dev/null
+++ b/vllm_omni/platforms/maca/worker/__init__.py
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+from vllm_omni.platforms.maca.worker.maca_ar_worker import MacaARWorker
+from vllm_omni.platforms.maca.worker.maca_generation_worker import MacaGenerationWorker
+
+__all__ = ["MacaARWorker", "MacaGenerationWorker"]
diff --git a/vllm_omni/platforms/maca/worker/maca_ar_worker.py b/vllm_omni/platforms/maca/worker/maca_ar_worker.py
new file mode 100644
index 0000000000..baa345443e
--- /dev/null
+++ b/vllm_omni/platforms/maca/worker/maca_ar_worker.py
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+"""MACA (MetaX) AR worker for vLLM-Omni.
+
+MetaX uses the CUDA-compatible runtime (``device_type="cuda"`` in vLLM-metax); this
+worker reuses the standard Omni GPU AR worker implementation.
+"""
+
+from vllm_omni.worker.gpu_ar_worker import GPUARWorker
+
+
+class MacaARWorker(GPUARWorker):
+    """Autoregressive omni stages on MetaX MACA via vLLM-metax."""
diff --git a/vllm_omni/platforms/maca/worker/maca_generation_worker.py b/vllm_omni/platforms/maca/worker/maca_generation_worker.py
new file mode 100644
index 0000000000..3680d9abf6
--- /dev/null
+++ b/vllm_omni/platforms/maca/worker/maca_generation_worker.py
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+"""MACA (MetaX) generation worker for vLLM-Omni.
+
+Non-AR stages use the same CUDA-compatible device path as ``GPUGenerationWorker``.
+"""
+
+from vllm_omni.worker.gpu_generation_worker import GPUGenerationWorker
+
+
+class MacaGenerationWorker(GPUGenerationWorker):
+    """Non-autoregressive generation stages on MetaX MACA via vLLM-metax."""
diff --git a/vllm_omni/quantization/int8_config.py b/vllm_omni/quantization/int8_config.py
index 37d4300470..bc8846d5b1 100644
--- a/vllm_omni/quantization/int8_config.py
+++ b/vllm_omni/quantization/int8_config.py
@@ -148,6 +148,8 @@ def get_quant_method(
             if not self.is_checkpoint_int8_serialized:
                 if current_omni_platform.is_cuda():
                     online_method = Int8OnlineLinearMethod(self)
+                elif current_omni_platform.is_maca():
+                    online_method = Int8OnlineLinearMethod(self)
                 elif current_omni_platform.is_npu():
                     online_method = NPUInt8OnlineLinearMethod(self)
                 else:
@@ -156,6 +158,8 @@ def get_quant_method(
             else:
                 if current_omni_platform.is_cuda():
                     offline_method = Int8LinearMethod(self)
+                elif current_omni_platform.is_maca():
+                    offline_method = Int8LinearMethod(self)
                 elif current_omni_platform.is_npu():
                     offline_method = NPUInt8LinearMethod(self)
                 else: