diff --git a/mace/kernels/opencl/batch_norm_opencl.cc b/mace/kernels/opencl/batch_norm_opencl.cc
index 4d0771f15819e71496100e441799801f35b191f2..fbb0d7a4043a4467d4ce7771db7ae4e4cb9d3e51 100644
--- a/mace/kernels/opencl/batch_norm_opencl.cc
+++ b/mace/kernels/opencl/batch_norm_opencl.cc
@@ -29,7 +29,7 @@ void BatchNormFunctor<DeviceType::OPENCL, float>::operator()(
   auto bm_kernel = cl::Kernel(program, "batch_norm");
 
   const uint32_t kwg_size = runtime->GetKernelMaxWorkGroupSize(bm_kernel);
-  const uint32_t lws[3] = {1, kwg_size/128, 128};
+  const uint32_t lws[3] = {1, 1, kwg_size};
 
   uint32_t idx = 0;
   bm_kernel.setArg(idx++, *(static_cast<const cl::Buffer *>(input->buffer())));
@@ -43,6 +43,7 @@ void BatchNormFunctor<DeviceType::OPENCL, float>::operator()(
   bm_kernel.setArg(idx++, lws[1] * sizeof(float), nullptr);
   bm_kernel.setArg(idx++, lws[1] * sizeof(float), nullptr);
 
+  //TODO need to design the new way to tune.
   cl_int error = runtime->command_queue().enqueueNDRangeKernel(
       bm_kernel, cl::NullRange,
       cl::NDRange(gws[0], gws[1], gws[2]),
diff --git a/mace/ops/ops_test_util.h b/mace/ops/ops_test_util.h
index 678f855fc7b98b5c7ec66f13e07e75ab121e067e..f8bb94c2d5fee156774222fff5d6a04e4cd4ca6b 100644
--- a/mace/ops/ops_test_util.h
+++ b/mace/ops/ops_test_util.h
@@ -137,13 +137,10 @@ class OpsTestNet {
   Workspace *ws() { return &ws_; }
 
   bool RunOp(DeviceType device) {
-    if (!net_ || device_ != device) {
-      NetDef net_def;
-      net_def.add_op()->CopyFrom(op_def_);
-      VLOG(3) << net_def.DebugString();
-      net_ = CreateNet(net_def, &ws_, device);
-      device_ = device;
-    }
+    NetDef net_def;
+    net_def.add_op()->CopyFrom(op_def_);
+    VLOG(3) << net_def.DebugString();
+    net_ = CreateNet(net_def, &ws_, device);
     return net_->Run();
   }
 
@@ -163,7 +160,6 @@ class OpsTestNet {
   Workspace ws_;
   OperatorDef op_def_;
   std::unique_ptr<NetBase> net_;
-  DeviceType device_;
 };
 
 class OpsTestBase : public ::testing::Test {
diff --git a/mace/utils/BUILD b/mace/utils/BUILD
index 06e2ccc490aef5f1a75920bd7cb0afeb9172f64c..e193887aaba89278242721644b341f02290c4b2b 100644
--- a/mace/utils/BUILD
+++ b/mace/utils/BUILD
@@ -28,3 +28,14 @@ cc_library(
     ],
     copts = ["-std=c++11"],
 )
+
+cc_library(
+    name = "tuner",
+    hdrs = [
+        "tuner.h",
+    ],
+    copts = ["-std=c++11"],
+    deps = [
+        "//mace/core",
+    ],
+)
diff --git a/mace/utils/tuner.h b/mace/utils/tuner.h
new file mode 100644
index 0000000000000000000000000000000000000000..4ad87ccc4aa8ac859962f45944c90e42a010d20a
--- /dev/null
+++ b/mace/utils/tuner.h
@@ -0,0 +1,135 @@
+//
+// Copyright (c) 2017 XiaoMi All rights reserved.
+//
+
+#ifndef MACE_UTILS_TUNER_H_
+#define MACE_UTILS_TUNER_H_
+#include <stdlib.h>
+#include <vector>
+#include <functional>
+#include <string>
+#include <unordered_map>
+#include <fstream>
+#include <chrono>
+#include <limits>
+
+#include "mace/core/logging.h"
+
+namespace mace {
+
+template<typename param_type>
+class Tuner {
+ public:
+  static Tuner* Get() {
+    static Tuner tuner;
+    return &tuner;
+  }
+  void TuneOrRun(const std::string &param_key,
+              const std::vector<param_type> &default_param,
+              std::function<std::vector<std::vector<param_type>>()> param_generator,
+              const std::function<void(const std::vector<param_type> &)> &func) {
+
+    if (param_generator == nullptr) {
+      // run
+      if (param_table_.find(param_key) != param_table_.end()) {
+        func(param_table_[param_key]);
+      } else {
+        func(default_param);
+      }
+    } else {
+      // tune
+      std::vector<param_type> opt_param = default_param;
+      Tune(param_generator, func, opt_param);
+      param_table_[param_key] = opt_param;
+    }
+  }
+
+ private:
+  Tuner() {
+    path_ = getenv("MACE_RUN_PARAMTER_PATH");
+    ReadRunParamters();
+  }
+
+  ~Tuner() {
+    WriteRunParameters();
+  }
+
+  Tuner(const Tuner&) = delete;
+  Tuner& operator=(const Tuner&) = delete;
+
+  inline void WriteRunParameters() {
+    if (path_ != nullptr) {
+      std::ofstream ofs(path_, std::ios::binary | std::ios::out);
+      if (ofs.is_open()) {
+        for (auto &kp : param_table_) {
+          int32_t key_size = kp.first.size() + 1;
+          ofs.write(static_cast<char*>(&key_size), sizeof(key_size));
+          ofs.write(&kp.first.c_str(), key_size);
+
+          auto &params = kp.second;
+          int32_t params_size = params.size() * sizeof(param_type);
+          ofs.write(static_cast<char*>(&params_size), sizeof(params_size));
+          for (auto &param : params) {
+            ofs.write(&param, sizeof(params_size));
+          }
+        }
+        ofs.close();
+      } else {
+        LOG(WARNING) << "Write run parameter file failed.";
+      }
+    }
+  }
+
+  inline void ReadRunParamters() {
+    if (path_ != nullptr) {
+      std::ifstream ifs(path_, std::ios::binary | std::ios::in);
+      if (ifs.is_open()) {
+        int32_t key_size = 0;
+        int32_t params_size = 0;
+        int32_t params_count = 0;
+        while (!ifs.eof()) {
+          ifs.read(static_cast<char*>(&key_size), sizeof(key_size));
+          std::string key(key_size, '');
+          ifs.read(&key[0], key_size);
+
+          ifs.read(static_cast<char*>(&params_size), sizeof(params_size));
+          params_count = params_size / sizeof(param_type);
+          std::vector<param_type> params(params_count);
+          for (int i = 0; i < params_count; ++i) {
+            ifs.read(&params[i], sizeof(param_type));
+          }
+          param_table_.emplace(key, params);
+        }
+        ifs.close();
+      } else {
+        LOG(WARNING) << "Write run parameter file failed.";
+      }
+    }
+  }
+
+  inline void Tune(std::function<std::vector<std::vector<param_type>>()> param_generator,
+                   const std::function<void(const std::vector<param_type> &)> &func,
+                   std::vector<param_type> &opt_params) {
+    double opt_time = std::numeric_limits<double>::max();
+    auto params = param_generator();
+    for (const auto &param: params) {
+      auto start = std::chrono::high_resolution_clock::now();
+      func(param);
+      auto end = std::chrono::high_resolution_clock::now();
+      auto duration_time = end - start;
+
+      // Check the execution time
+      if (duration_time.count() < opt_time) {
+        opt_time = duration_time.count();
+        opt_params = param;
+      }
+    }
+  }
+
+ private:
+  const char* path_;
+  std::unordered_map<std::string, std::vector<param_type>> param_table_;
+};
+
+} //  namespace mace
+#endif //  MACE_UTILS_TUNER_H_