diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/arithmetic_cpu_kernel.cc b/mindspore/ccsrc/backend/kernel_compiler/cpu/arithmetic_cpu_kernel.cc
index 68abdcd6d47..06e1ecd4cda 100644
--- a/mindspore/ccsrc/backend/kernel_compiler/cpu/arithmetic_cpu_kernel.cc
+++ b/mindspore/ccsrc/backend/kernel_compiler/cpu/arithmetic_cpu_kernel.cc
@@ -104,6 +104,8 @@ void ElementRealDiv(const T *input1, const T *input2, T *out, size_t size, size_
   for (size_t i = 0; i < size; ++i) {
     auto dividend = input1[idx_1];
     auto divisor = input2[idx_2];
+    idx_1 += delta_1;
+    idx_2 += delta_2;
     if (divisor == zero) {
       if (dividend == zero) {
         out[i] = std::numeric_limits<T>::quiet_NaN();
@@ -117,8 +119,6 @@ void ElementRealDiv(const T *input1, const T *input2, T *out, size_t size, size_
       continue;
     }
     out[i] = dividend / divisor;
-    idx_1 += delta_1;
-    idx_2 += delta_2;
   }
 }
 
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/reduce_cpu_kernel.cc b/mindspore/ccsrc/backend/kernel_compiler/cpu/reduce_cpu_kernel.cc
index 0f2439f71e3..5a5c510ae34 100644
--- a/mindspore/ccsrc/backend/kernel_compiler/cpu/reduce_cpu_kernel.cc
+++ b/mindspore/ccsrc/backend/kernel_compiler/cpu/reduce_cpu_kernel.cc
@@ -79,8 +79,9 @@ template <typename T>
 void ReduceCPUKernel<T>::SimpleReduce(size_t start, size_t end, size_t stride, const T *input_addr, T *output_addr) {
   auto pos = start * stride;
   for (size_t i = start; i < end; ++i) {
-    output_addr[i] = 0;
-    for (size_t j = 0; j < stride; ++j) {
+    output_addr[i] = input_addr[pos];
+    pos++;
+    for (size_t j = 1; j < stride; ++j) {
       reduce_func_(input_addr, pos, &output_addr[i]);
       pos++;
     }
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/stridedslice_cpu_kernel.cc b/mindspore/ccsrc/backend/kernel_compiler/cpu/stridedslice_cpu_kernel.cc
index 533c7361122..da875f64d1e 100644
--- a/mindspore/ccsrc/backend/kernel_compiler/cpu/stridedslice_cpu_kernel.cc
+++ b/mindspore/ccsrc/backend/kernel_compiler/cpu/stridedslice_cpu_kernel.cc
@@ -31,7 +31,8 @@ enum PosType { kBegin, kEnd };
 int NormalizePos(int pos, int dim_len, PosType pos_type) {
   if (pos < 0) {
     int normal_pos = pos + dim_len;
-    normal_pos = std::max(normal_pos, 0);
+    int threshold = pos_type == kBegin ? 0 : -1;
+    normal_pos = std::max(normal_pos, threshold);
     return normal_pos;
   }
   int max_pos = pos_type == kBegin ? dim_len - 1 : dim_len;