diff --git a/mindspore/lite/src/common/string_util.cc b/mindspore/lite/src/common/string_util.cc
index 99c0830270..82de77790e 100644
--- a/mindspore/lite/src/common/string_util.cc
+++ b/mindspore/lite/src/common/string_util.cc
@@ -20,7 +20,7 @@ namespace mindspore {
 namespace lite {
 
 std::vector<StringPack> ParseTensorBuffer(Tensor *tensor) {
-  if (tensor->MutableData() == nullptr) {
+  if (tensor->data_c() == nullptr) {
     MS_LOG(ERROR) << "Tensor data is null, cannot be parsed";
     return std::vector<StringPack>{};
   }
diff --git a/mindspore/lite/src/lite_session.cc b/mindspore/lite/src/lite_session.cc
index 649f0e1d12..d68200d6e3 100644
--- a/mindspore/lite/src/lite_session.cc
+++ b/mindspore/lite/src/lite_session.cc
@@ -65,8 +65,12 @@ int LiteSession::ConvertTensors(const lite::Model *model) {
       MS_LOG(DEBUG) << "Dims of " << i << "th tensor is nullptr";
     } else {
       if (TensorCategory(srcTensor) == Tensor::Category::CONST) {
-        for (size_t j = 0; j < srcTensor->dims()->size(); j++) {
-          shape.push_back(srcTensor->dims()->data()[j]);
+        if (srcTensor->dataType() == kObjectTypeString && srcTensor->data() != nullptr) {
+          shape.push_back(srcTensor->data()->size());
+        } else {
+          for (size_t j = 0; j < srcTensor->dims()->size(); j++) {
+            shape.push_back(srcTensor->dims()->data()[j]);
+          }
         }
       }
     }
diff --git a/mindspore/lite/src/runtime/kernel/arm/string/hashtable_lookup.cc b/mindspore/lite/src/runtime/kernel/arm/string/hashtable_lookup.cc
index 501571a3c6..596aa90c19 100644
--- a/mindspore/lite/src/runtime/kernel/arm/string/hashtable_lookup.cc
+++ b/mindspore/lite/src/runtime/kernel/arm/string/hashtable_lookup.cc
@@ -48,11 +48,12 @@ int HashtableLookupCPUKernel::Run() {
   auto output_tensor = out_tensors_.at(0);
   auto hits_tensor = out_tensors_.at(1);
 
-  int rows = values_tensor->DimensionSize(0);
+  int rows = GetStringCount(values_tensor);
   int32_t *input_data = reinterpret_cast<int32_t *>(input_tensor->MutableData());
   uint8_t *hits_data = reinterpret_cast<uint8_t *>(hits_tensor->MutableData());
-  std::vector<lite::StringPack> output_string_pack;
+  std::vector<lite::StringPack> output_string_pack(input_tensor->ElementsNum());
   std::vector<lite::StringPack> all_string_pack = ParseTensorBuffer(values_tensor);
+  lite::StringPack null_string_pack = {0, nullptr};
 
   for (int i = 0; i < input_tensor->ElementsNum(); i++) {
     int index = -1;
@@ -61,11 +62,10 @@ int HashtableLookupCPUKernel::Run() {
       index = reinterpret_cast<int32_t *>(p) - reinterpret_cast<int32_t *>(keys_tensor->MutableData());
     }
     if (index >= rows || index < 0) {
-      lite::StringPack tmp = {0, nullptr};
-      output_string_pack.push_back(tmp);
+      output_string_pack[i] = null_string_pack;
       hits_data[i] = 0;
     } else {
-      output_string_pack.push_back(all_string_pack[i]);
+      output_string_pack[i] = all_string_pack[i];
       hits_data[i] = 1;
     }
   }
diff --git a/mindspore/lite/src/runtime/kernel/arm/string/predict.cc b/mindspore/lite/src/runtime/kernel/arm/string/predict.cc
index fc552a075b..15c2fc9085 100644
--- a/mindspore/lite/src/runtime/kernel/arm/string/predict.cc
+++ b/mindspore/lite/src/runtime/kernel/arm/string/predict.cc
@@ -88,9 +88,10 @@ int PredictCPUKernel::Run() {
     if (static_cast<size_t>(i) >= label_info_vec.size() || label_info_vec[i].weight < param->weight_threshold) {
       output_label[i] = -1;
       output_weight[i] = 0.0f;
+    } else {
+      output_label[i] = label_info_vec[i].label;
+      output_weight[i] = label_info_vec[i].weight;
     }
-    output_label[i] = label_info_vec[i].label;
-    output_weight[i] = label_info_vec[i].weight;
   }
   return RET_OK;
 }