diff --git a/mace/ops/eltwise.cc b/mace/ops/eltwise.cc
index bfe0074289363169ab41af72db5489b343ff2c84..b09cb05dd1a07da26f88f83ba7c0d7a28465417c 100644
--- a/mace/ops/eltwise.cc
+++ b/mace/ops/eltwise.cc
@@ -872,6 +872,9 @@ class EltwiseOp : public Operation {
 
   MaceStatus Run(OpContext *context) override {
     MACE_UNUSED(context);
+    MACE_CHECK(this->InputSize() < 3,
+               "Element-Wise does not support 3 or higher inputs,"
+               " you could change your model to multiple Element-Wise");
     const Tensor *input0 = this->Input(0);
     const Tensor *input1 = this->InputSize() == 2 ? this->Input(1) : nullptr;
     Tensor *output = this->Output(0);
@@ -1179,6 +1182,9 @@ class EltwiseOp<DeviceType::GPU, T> : public Operation {
     }
   }
   MaceStatus Run(OpContext *context) override {
+    MACE_CHECK(this->InputSize() < 3,
+               "Element-Wise does not support 3 or higher inputs,"
+               " you could change your model to multiple Element-Wise");
     const Tensor *input0 = this->Input(0);
     const Tensor *input1 = this->InputSize() == 2 ? this->Input(1) : nullptr;
     Tensor *output = this->Output(0);
diff --git a/tools/sh_commands.py b/tools/sh_commands.py
index 3b98c7a691bf6a047bdc91bfd4c90cc36d336d4e..a5c50fc4ca7dd8fa51352b5e428ab803380d17cc 100644
--- a/tools/sh_commands.py
+++ b/tools/sh_commands.py
@@ -787,7 +787,7 @@ def validate_model(abi,
                 "--output_data_format=%s" % ",".join(output_data_formats),
                 "--validation_threshold=%f" % validation_threshold,
                 "--input_data_type=%s" % ",".join(input_data_types),
-                "--backend=%s" % ",".join(backend),
+                "--backend=%s" % backend,
                 "--validation_outputs_data=%s" % ",".join(
                     validation_outputs_data),
                 "--log_file=%s" % log_file,