diff --git a/mindspore/lite/tools/converter/anf_transform.cc b/mindspore/lite/tools/converter/anf_transform.cc
index 3f47e71115..6f52a97a41 100644
--- a/mindspore/lite/tools/converter/anf_transform.cc
+++ b/mindspore/lite/tools/converter/anf_transform.cc
@@ -80,9 +80,8 @@ FuncGraphPtr AnfTransform::Transform(const FuncGraphPtr &old_graph, const conver
         return nullptr;
       }
     } else if (config->quantType == schema::QuantType_WeightQuant) {
-      auto bitNum = static_cast<size_t>(std::stoull(config->bitNum));
-      if (bitNum != quant::UINT8_QUANTIZATION) {
-        MS_LOG(ERROR) << "Current Only Support 8 bit weight quant";
+      if (quant::WeightQuantizer::WeightQuantInputCheck(config) != RET_OK) {
+        MS_LOG(ERROR) << "weight quant input param error";
         ReturnCode::GetSingleReturnCode()->UpdateReturnCode(RET_ERROR);
         return nullptr;
       }
diff --git a/mindspore/lite/tools/converter/quantizer/quantize_util.h b/mindspore/lite/tools/converter/quantizer/quantize_util.h
index 1c90eb7b03..979c0c3518 100644
--- a/mindspore/lite/tools/converter/quantizer/quantize_util.h
+++ b/mindspore/lite/tools/converter/quantizer/quantize_util.h
@@ -124,7 +124,7 @@ STATUS QuantFilter(ParamValueLitePtr weight, std::shared_ptr<PrimitiveC> primiti
   auto dims = weight->tensor_shape();
   if (per_channel) {
     if (dims.size() != 4) {
-      MS_LOG(ERROR) << "weight dims size error: " << dims.size() << " Back to per layer.";
+      MS_LOG(ERROR) << "weight dims size: " << dims.size() << " switch to per-layer quant mode.";
       per_channel = false;
     } else {
       uint32_t channels = dims[0];
diff --git a/mindspore/lite/tools/converter/quantizer/weight_quantizer.cc b/mindspore/lite/tools/converter/quantizer/weight_quantizer.cc
index f1861be3a0..cac77c98c7 100644
--- a/mindspore/lite/tools/converter/quantizer/weight_quantizer.cc
+++ b/mindspore/lite/tools/converter/quantizer/weight_quantizer.cc
@@ -27,6 +27,33 @@ using std::vector;
 namespace mindspore {
 namespace lite {
 namespace quant {
+bool WeightQuantizer::IsPosNum(const std::string &str) {
+  for (size_t i = 0; i < str.size(); i++) {
+    if (str.at(i) < '0' || str.at(i) > '9') {
+      return false;
+    }
+    if (str.at(i) == '0' && i == 0 && str.size() != 1) {
+      return false;
+    }
+  }
+  return true;
+}
+STATUS WeightQuantizer::WeightQuantInputCheck(const converter::Flags *config) {
+  MS_ASSERT(config != nullptr);
+  if (!WeightQuantizer::IsPosNum(config->convWeightQuantChannelThreshold)) {
+    MS_LOG(ERROR) << "convWeightQuantChannelThreshold must be valid pos num.";
+    return RET_ERROR;
+  }
+  if (!WeightQuantizer::IsPosNum(config->quantSize)) {
+    MS_LOG(ERROR) << "quantSize must be valid pos num.";
+    return RET_ERROR;
+  }
+  if (!WeightQuantizer::IsPosNum(config->bitNum) || config->bitNum != "8") {
+    MS_LOG(ERROR) << "bitNum must be valid pos num, current only support 8 bit weight quant.";
+    return RET_ERROR;
+  }
+  return RET_OK;
+}
 WeightQuantizer::WeightQuantizer(FuncGraphPtr graph, const string &weightSize,
                                  const std::string &convWeightChannelThreshold, const std::string &bitNum)
     : Quantizer(graph) {
diff --git a/mindspore/lite/tools/converter/quantizer/weight_quantizer.h b/mindspore/lite/tools/converter/quantizer/weight_quantizer.h
index 7485343873..7d0f42ff59 100644
--- a/mindspore/lite/tools/converter/quantizer/weight_quantizer.h
+++ b/mindspore/lite/tools/converter/quantizer/weight_quantizer.h
@@ -41,6 +41,8 @@ class WeightQuantizer : public Quantizer {
   STATUS DoQuantize(FuncGraphPtr funcGraph) override;
   STATUS DoConvQuantize(const std::list<CNodePtr> &nodes);
   STATUS DoMulQuantize(const std::list<CNodePtr> &nodes);
+  static STATUS WeightQuantInputCheck(const converter::Flags *config);
+  static bool IsPosNum(const std::string &str);
   int quant_max{INT8_MAX};
   int quant_min{INT8_MIN};
  private: