diff --git a/src/operators/kernel/arm/concat_kernel.cpp b/src/operators/kernel/arm/concat_kernel.cpp
index 2a653234a6c18664a134d89383ae99eb3681eeda..705b698dbe9e9768713417f85ae2879df66acf9e 100644
--- a/src/operators/kernel/arm/concat_kernel.cpp
+++ b/src/operators/kernel/arm/concat_kernel.cpp
@@ -51,38 +51,6 @@ class ConcatFunctor {
     }
   }
 };
-// template <typename T>
-// void StridedNumelCopyWithAxis(int64_t axis, T *dst,
-//                              const framework::DDim &dst_stride_numel,
-//                              const T *src,
-//                              const framework::DDim &src_stride_numel,
-//                              int64_t size) {
-//  int64_t before = dst_stride_numel[0] / dst_stride_numel[axis];
-//  int64_t src_after = src_stride_numel[axis];
-//  int64_t dst_after = dst_stride_numel[axis];
-//
-//  /// "src and dst tensor should have the same dims size."
-//  assert(src_stride_numel.size() == dst_stride_numel.size());
-//
-//  for (int64_t i = 0; i < axis; ++i) {
-//    if (i < axis) {
-//      /// src and dst should have the same elements
-//      /// except the specified axis.
-//      assert(src_stride_numel[i] / src_stride_numel[axis] ==
-//             dst_stride_numel[i] / dst_stride_numel[axis]);
-//
-//    } else if (i == axis) {
-//      continue;
-//    } else {
-//      /// "src and dst should have the same elements "
-//      ///         "except the specified axis."
-//      assert(src_stride_numel[i] == dst_stride_numel[i]);
-//    }
-//  }
-//  for (int64_t i = 0; i < before; ++i) {
-//    memory::Copy(dst + i * dst_after, src + i * src_after, sizeof(T) * size);
-//  }
-//}
 
 template <>
 void ConcatKernel<CPU, float>::Compute(const ConcatParam &param) const {