diff --git a/lite/kernels/opencl/activation_image_compute.cc b/lite/kernels/opencl/activation_image_compute.cc
index de552fe935a18daa0a141e2b89b5adfb77619c2a..6fe7e95ba2dd4faa51b891be6b98311618349714 100644
--- a/lite/kernels/opencl/activation_image_compute.cc
+++ b/lite/kernels/opencl/activation_image_compute.cc
@@ -81,10 +81,6 @@ class ActivationComputeImageDefault
                                     "image/activation_kernel.cl",
                                     build_options_,
                                     time_stamp_);
-
-    STL::stringstream kernel_key;
-    kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
-    auto kernel = context.cl_context()->GetKernel(kernel_key.str());
   }
 
   void ReInitWhenNeeded() override {
@@ -119,10 +115,11 @@ class ActivationComputeImageDefault
         out_img_shape_[0], out_img_shape_[1]);
     auto& context = ctx_->As<OpenCLContext>();
     CHECK(context.cl_context() != nullptr);
+
     std::stringstream kernel_key;
     kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
     auto kernel = context.cl_context()->GetKernel(kernel_key.str());
-    ;
+
     cl_int status;
     status = kernel->setArg(0, *x_img);
     CL_CHECK_FATAL(status);
@@ -170,7 +167,6 @@ class ActivationComputeImageDefault
   std::string kernel_func_name_{};
   float threshold_{6.f};
   float scale_{1.f};
-  cl::Kernel kernel;
   bool first_epoch_for_reinit_{true};
   cl::NDRange global_work_size_ = cl::NDRange{
       static_cast<size_t>(1), static_cast<size_t>(1), static_cast<size_t>(1)};
diff --git a/lite/kernels/opencl/fc_buffer_compute.cc b/lite/kernels/opencl/fc_buffer_compute.cc
index 3934994619825938ceaa2aeaa05efbc3696a2214..87d3f34be5772495a3fc19053507f32d04e3f361 100644
--- a/lite/kernels/opencl/fc_buffer_compute.cc
+++ b/lite/kernels/opencl/fc_buffer_compute.cc
@@ -108,7 +108,6 @@ class FcCompute
     std::stringstream kernel_key;
     kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
     auto kernel = context.cl_context()->GetKernel(kernel_key.str());
-    ;
     cl_int status;
     status = kernel->setArg(0, *x_buf);
     CL_CHECK_FATAL(status);
@@ -145,7 +144,7 @@ class FcCompute
   bool first_epoch_for_reinit_{true};
   DDim last_x_dims_;
   cl::NDRange global_work_size_;
-  cl::Kernel kernel;
+
   std::shared_ptr<cl::Event> event_{new cl::Event};
 };
 
diff --git a/lite/kernels/opencl/scale_image_compute.cc b/lite/kernels/opencl/scale_image_compute.cc
index 4ca741755a027fa642c17563d5cb5b3a7eb09c52..56c8373f17f8023426ff4f8bf1304af86f493662 100644
--- a/lite/kernels/opencl/scale_image_compute.cc
+++ b/lite/kernels/opencl/scale_image_compute.cc
@@ -85,7 +85,6 @@ class ScaleComputeImage2D : public KernelLite<TARGET(kOpenCL),
     std::stringstream kernel_key;
     kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
     auto kernel = context.cl_context()->GetKernel(kernel_key.str());
-    ;
     cl_int status;
     status = kernel->setArg(0, *x_img);
     CL_CHECK_FATAL(status);
@@ -114,7 +113,7 @@ class ScaleComputeImage2D : public KernelLite<TARGET(kOpenCL),
   std::shared_ptr<cl::Event> event_{new cl::Event};
 
   param_t* scale_param_{nullptr};
-  cl::Kernel kernel;
+
   bool first_epoch_for_reinit_{true};
   DDim last_x_dims_;
   DDim out_img_shape_ = DDim(std::vector<DDim::value_type>(