diff --git a/python/sglang/srt/hardware_backend/npu/quantization/moe_methods.py b/python/sglang/srt/hardware_backend/npu/quantization/moe_methods.py
index e36e1ba36..aa307b19c 100644
--- a/python/sglang/srt/hardware_backend/npu/quantization/moe_methods.py
+++ b/python/sglang/srt/hardware_backend/npu/quantization/moe_methods.py
@@ -333,11 +333,6 @@ class NPUW8A8Int8MoEMethod(_NPUMoEMethodBase):
         # Process weight
         weight: torch.Tensor = getattr(layer, f"{weight_prefix}_weight")
         weight.data = npu_format_cast(weight.data.transpose(1, 2))
-        setattr(
-            layer,
-            f"{weight_prefix}_weight",
-            torch.nn.Parameter(weight, requires_grad=False),
-        )
 
         # Set dispatcher output dtype
         if weight_prefix == "w13":
@@ -442,11 +437,6 @@ class NPUW4A8Int8MoEMethod(_NPUMoEMethodBase):
         weight = getattr(layer, f"{weight_prefix}_weight")
         weight.data = npu_format_cast(weight.data.transpose(1, 2))
         weight.data = self._pack_to_int32(weight.data)
-        setattr(
-            layer,
-            f"{weight_prefix}_weight",
-            torch.nn.Parameter(weight, requires_grad=False),
-        )
 
         # Set dispatcher output dtype
         if weight_prefix == "w13":
@@ -579,11 +569,6 @@ class NPUWNA16Int4MoEMethod(_NPUMoEMethodBase):
             .int()
         )
         weight.data = self._pack_to_int32(unpacked_weight)
-        setattr(
-            layer,
-            f"{weight_prefix}_weight",
-            torch.nn.Parameter(weight, requires_grad=False),
-        )
 
         # Set dispatcher output dtype
         if weight_prefix == "w13":
@@ -704,11 +689,6 @@ class NPUUnquantMoEMethod(_NPUMoEMethodBase):
 
         weight: torch.Tensor = getattr(layer, f"{weight_prefix}_weight")
         weight.data = npu_format_cast(weight)
-        setattr(
-            layer,
-            f"{weight_prefix}_weight",
-            torch.nn.Parameter(weight, requires_grad=False),
-        )
 
         if weight_prefix == "w13":
             self._set_dispatcher_output_dtype(layer, "bf16")