diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b491694ff0d380114e46e1fb8fcbe43d9ee26ff..eb0ffd459e28644deec4ad71e107d40e502e05f0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,12 @@ file(GLOB_RECURSE PADDLE_MOBILE_H src/*.h)
 
 include_directories(src/)
 
+option(USE_OPENMP "openmp support" OFF)
+if(USE_OPENMP)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
+    add_definitions(-DPADDLE_MOBILE_USE_OPENMP)
+endif()
+
 if (googlenet)
     add_definitions(-DCONCAT_OP)
     add_definitions(-DCONV_OP)
diff --git a/src/common/openmp-fix.cpp b/src/common/openmp-fix.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8c31ef45c68227c612155e826e664367a7917501
--- /dev/null
+++ b/src/common/openmp-fix.cpp
@@ -0,0 +1,27 @@
+/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#ifdef PADDLE_MOBILE_USE_OPENMP
+/**
+ * android-ndk-r17 has a problem when linking with openmp.
+ * if paddle-mobile enables -fopenmp, but didn't use those omp_* functions,
+ * after linking another binary with libpaddle-mobile.so, the omp_get_thread_num
+ * will not work. see test/common/test_openmp.cc the detailed reason is still
+ * unclear, but this trick will work. a better solution is hacking the linker,
+ * try some flags to make it link omp_* functions, but I didn't find out how to
+ * make it work.
+ */
+#include <omp.h>
+static int _ = omp_get_num_procs();
+#endif
diff --git a/src/operators/kernel/arm/sigmoid_kernel.cpp b/src/operators/kernel/arm/sigmoid_kernel.cpp
index c03a8644cc086e14a24abd32bf2bdb347187ce0e..20f275ff482d7073195d075c374e4a0969993714 100644
--- a/src/operators/kernel/arm/sigmoid_kernel.cpp
+++ b/src/operators/kernel/arm/sigmoid_kernel.cpp
@@ -41,7 +41,9 @@ void sigmoid(const Tensor *X, Tensor *Y) {
   int out_size = paddle_mobile::framework::product(outer_ddim);
   int inner_size = paddle_mobile::framework::product(inner_ddim);
 
-#pragma omp parallel for
+  DLOG << "outsize=" << out_size;
+  DLOG << "innersize=" << inner_size;
+  #pragma omp parallel for
   for (int i = 0; i < out_size; ++i) {
     const float *input_outer_ptr = input + i * inner_size;
     float *output_outer_ptr = output + i * inner_size;
diff --git a/src/operators/math/pooling.cpp b/src/operators/math/pooling.cpp
index 0a823f2cc066e487bf1e3131105b28c0a44e44a4..09bc2a6ae4a7b5f2876350375a333c457c72b68a 100644
--- a/src/operators/math/pooling.cpp
+++ b/src/operators/math/pooling.cpp
@@ -59,7 +59,7 @@ class PoolFunctor<CPU, PoolProcess, T> {
     T *output_data = output->mutable_data<T>();
 
     for (int i = 0; i < batch_size; i++) {
-#pragma omp parallel for
+      #pragma omp parallel for
       for (int c = 0; c < output_channels; ++c) {
         for (int ph = 0; ph < output_height; ++ph) {
           int hstart = ph * stride_height - padding_height;
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index a799c648b660625d0a61c89cbaf8b2b3d0eda2d1..7bde05f70c85b9ea363e58ff483d45436fd7abd2 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -121,6 +121,14 @@ else ()
     ADD_EXECUTABLE(test-enforce common/test_enforce.cpp)
     target_link_libraries(test-enforce paddle-mobile)
 
+    # gen test - test if openmp works
+    ADD_EXECUTABLE(test-openmp common/test_openmp.cc test_helper.h test_include.h executor_for_test.h)
+    target_link_libraries(test-openmp paddle-mobile)
+
+    # gen test
+    ADD_EXECUTABLE(test-yolo net/test_yolo.cpp test_helper.h  test_include.h executor_for_test.h)
+    target_link_libraries(test-yolo paddle-mobile)
+
     # gen test
     ADD_EXECUTABLE(test-mobilenetssd net/test_mobilenet+ssd.cpp test_helper.h  test_include.h executor_for_test.h)
     target_link_libraries(test-mobilenetssd paddle-mobile)
diff --git a/test/common/test_openmp.cpp b/test/common/test_openmp.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7393810a3cd5cafcd75e3964cc21d31036d83817
--- /dev/null
+++ b/test/common/test_openmp.cpp
@@ -0,0 +1,26 @@
+/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include <omp.h>
+#include <iostream>
+
+int main(void) {
+  #pragma omp parallel num_threads(2)
+  {
+    int thread_id = omp_get_thread_num();
+    int nthreads = omp_get_num_threads();
+    std::cout << "Hello, OMP " << thread_id << "/" << nthreads << "\n";
+  }
+  return 0;
+}
diff --git a/tools/pre-commit.hooks/clang-format.hook b/tools/pre-commit.hooks/clang-format.hook
index 406850d1a2450b49463563c0034c6c969895bfe4..4fa4253bad78fe287fb92863a684a5d7def71061 100644
--- a/tools/pre-commit.hooks/clang-format.hook
+++ b/tools/pre-commit.hooks/clang-format.hook
@@ -12,4 +12,8 @@ if ! [[ $version == *"$VERSION"* ]]; then
     exit -1
 fi
 
-clang-format $@
+# https://medicineyeh.wordpress.com/2017/07/13/clang-format-with-pragma/
+shift
+perl -i -pe 's|#pragma\s+omp|// <TRICKY-CLANG-FORMAT-PRAGMA-FIX> #pragma omp|' "$@"
+clang-format -i $@
+perl -i -pe 's|// <TRICKY-CLANG-FORMAT-PRAGMA-FIX> ||' "$@"