diff --git a/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.c b/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.c
index d065c0b95ea0431b6c8f00d808add337c573da46..9d3d5c47e331a60cf4dc5209cce3fa13e6a9be0c 100644
--- a/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.c
+++ b/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.c
@@ -49,6 +49,12 @@ void Uint8ToFloat32(const uint8_t *input, float *output, int number) {
   }
 }
 
+void Int8ToFloat32(const int8_t *input, float *output, int number) {
+  for (int i = 0; i < number; ++i) {
+    output[i] = (float)input[i];
+  }
+}
+
 void Int32ToFloat32(const int32_t *input, float *output, int number);
 
 void Int64ToFloat32(const int64_t *input, float *output, int number) {
diff --git a/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.h b/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.h
index 5e87bd5f758839c9536c087c24c68caebec3c5a5..21a2f34ebd09d88fb7c8ebb137ca0a3736e1b774 100644
--- a/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.h
+++ b/mindspore-src/source/mindspore/ccsrc/plugin/device/cpu/kernel/nnacl/base/cast_base.h
@@ -27,6 +27,8 @@ void BoolToFloat32(const bool *input, float *output, int number);
 
 void Uint8ToFloat32(const uint8_t *input, float *output, int number);
 
+void Int8ToFloat32(const int8_t *input, float *output, int number);
+
 void Int32ToFloat32(const int32_t *input, float *output, int number);
 
 void Int64ToFloat32(const int64_t *input, float *output, int number);
diff --git a/mindspore-src/source/mindspore/lite/src/litert/kernel/cpu/fp32/cast_fp32.cc b/mindspore-src/source/mindspore/lite/src/litert/kernel/cpu/fp32/cast_fp32.cc
index 08aec60c23aaf5d017c294ff737828f017df516c..a7ffc534f6c1e3613ff06261fa7d8ef24570e526 100644
--- a/mindspore-src/source/mindspore/lite/src/litert/kernel/cpu/fp32/cast_fp32.cc
+++ b/mindspore-src/source/mindspore/lite/src/litert/kernel/cpu/fp32/cast_fp32.cc
@@ -75,6 +75,10 @@ int CastCPUKernel::CastToFp32(const lite::Tensor *input, lite::Tensor *output, i
       Uint8ToFloat32(reinterpret_cast<const uint8_t *>(input->data()) + offset,
                      reinterpret_cast<float *>(output_data) + offset, data_num);
       break;
+    case kNumberTypeInt8:
+      Int8ToFloat32(reinterpret_cast<const int8_t *>(input->data()) + offset,
+                     reinterpret_cast<float *>(output_data) + offset, data_num);
+      break;
     case kNumberTypeInt32:
       Int32ToFloat32(reinterpret_cast<const int32_t *>(input->data()) + offset,
                      reinterpret_cast<float *>(output_data) + offset, data_num);