diff --git a/paddle/function/cross_map_normal_op.cpp b/paddle/function/cross_map_normal_op.cpp
index a9c7693830542f0e0d852f629d210b92a5bf2069..74094bc4fc8052aba0ae955217311e28eda7c2a7 100644
--- a/paddle/function/cross_map_normal_op.cpp
+++ b/paddle/function/cross_map_normal_op.cpp
@@ -128,11 +128,11 @@ public:
   void calc(const Arguments& inputs,
             const Arguments& outputs,
             const Arguments& inouts) override {
-    CHECK_EQ(1, inputs.size());
-    CHECK_EQ(2, outputs.size());
-    CHECK_EQ(0, inouts.size());
+    CHECK_EQ(1, static_cast<int>(inputs.size()));
+    CHECK_EQ(2, static_cast<int>(outputs.size()));
+    CHECK_EQ(0, static_cast<int>(inouts.size()));
 
-    CHECK_EQ(inputs[0].dims_.size(), 4);
+    CHECK_EQ(static_cast<int>(inputs[0].dims_.size()), 4);
     for (size_t i = 0; i < inputs[0].dims_.size(); i++) {
       CHECK_EQ(inputs[0].dims_[i], outputs[0].dims_[i]);
       CHECK_EQ(inputs[0].dims_[i], outputs[1].dims_[i]);
@@ -180,11 +180,11 @@ public:
   void calc(const Arguments& inputs,
             const Arguments& outputs,
             const Arguments& inouts) override {
-    CHECK_EQ(4, inputs.size());
-    CHECK_EQ(1, outputs.size());
-    CHECK_EQ(0, inouts.size());
+    CHECK_EQ(4, static_cast<int>(inputs.size()));
+    CHECK_EQ(1, static_cast<int>(outputs.size()));
+    CHECK_EQ(0, static_cast<int>(inouts.size()));
 
-    CHECK_EQ(inputs[0].dims_.size(), 4);
+    CHECK_EQ(static_cast<int>(inputs[0].dims_.size()), 4);
     for (size_t i = 0; i < inputs[0].dims_.size(); i++) {
       CHECK_EQ(inputs[0].dims_[i], inputs[1].dims_[i]);
       CHECK_EQ(inputs[0].dims_[i], inputs[2].dims_[i]);
diff --git a/paddle/gserver/layers/ConvProjection.cpp b/paddle/gserver/layers/ConvProjection.cpp
index e1c4b91ace21522a3bc640dfc4eaa1a42668ed02..0281170bc59855f6f4d2f4212523275a92d202d5 100644
--- a/paddle/gserver/layers/ConvProjection.cpp
+++ b/paddle/gserver/layers/ConvProjection.cpp
@@ -130,7 +130,8 @@ void ConvProjection::reshapeTensorDesc(int batchSize) {
 void ConvProjection::reshape(int batchSize) {
   size_t width = calOutputSize();
   CHECK_EQ(width, out_->value->getWidth());
-  CHECK_EQ(channels_ * imageH_ * imageW_, in_->value->getWidth())
+  CHECK_EQ(static_cast<size_t>(channels_ * imageH_ * imageW_),
+           in_->value->getWidth())
       << "Wrong input size for convolution"
       << " channels=" << channels_ << " imageH=" << imageH_
       << " imageW=" << imageW_ << " inputSize=" << in_->value->getWidth();
diff --git a/paddle/gserver/tests/LayerGradUtil.cpp b/paddle/gserver/tests/LayerGradUtil.cpp
index 57c176810fddf96828c210807673b7d1a3c739c0..ae016e74eaa84f7c43a30c09c8c4577e25360c4e 100644
--- a/paddle/gserver/tests/LayerGradUtil.cpp
+++ b/paddle/gserver/tests/LayerGradUtil.cpp
@@ -310,7 +310,7 @@ void initDataLayer(TestConfig testConf,
         testConf.inputDefs[i].labelSeqStartPositions;
     if (labelSeqStartPositions.size() != 0) {
       CHECK(!sequenceStartPositions);
-      CHECK_GE(labelSeqStartPositions.size(), 2);
+      CHECK_GE(static_cast<int>(labelSeqStartPositions.size()), 2);
 
       sequenceStartPositions =
           ICpuGpuVector::create(labelSeqStartPositions.size(), useGpu);
diff --git a/paddle/gserver/tests/test_BatchNorm.cpp b/paddle/gserver/tests/test_BatchNorm.cpp
index 7f5fcb670b70aed9f0a04180d344556a0390122f..e000c6994407cd73fec35b2bd1e644308ff25a8c 100644
--- a/paddle/gserver/tests/test_BatchNorm.cpp
+++ b/paddle/gserver/tests/test_BatchNorm.cpp
@@ -114,8 +114,8 @@ TEST(Layer, batchNorm) {
   bnLayer->forward(PASS_GC);
   convLayer->forward(PASS_GC);
 
-  CHECK_EQ(convLayer->getOutputValue()->getHeight(), 100);
-  CHECK_EQ(convLayer->getOutputValue()->getWidth(), 576);
+  CHECK_EQ(static_cast<int>(convLayer->getOutputValue()->getHeight()), 100);
+  CHECK_EQ(static_cast<int>(convLayer->getOutputValue()->getWidth()), 576);
 }
 
 int main(int argc, char** argv) {
diff --git a/paddle/gserver/tests/test_PyDataProvider2.cpp b/paddle/gserver/tests/test_PyDataProvider2.cpp
index 5f8bc5ecd0f77efc6dcda0330f124ca6cab7f277..7e193eb31a03e6a6b8b0b02e89608a0e02b9e248 100644
--- a/paddle/gserver/tests/test_PyDataProvider2.cpp
+++ b/paddle/gserver/tests/test_PyDataProvider2.cpp
@@ -293,7 +293,7 @@ TEST(PyDataProvider2, can_over_batch_size) {
   while (true) {
     int64_t realBatchSize = provider->getNextBatchInternal(batchSize, &batch);
     if (realBatchSize) {
-      CHECK_LE(realBatchSize, batchSize);
+      CHECK_LE(static_cast<size_t>(realBatchSize), batchSize);
     } else {
       break;
     }
diff --git a/paddle/math/Matrix.cpp b/paddle/math/Matrix.cpp
index 50d2e3eb671028c8169321fcd85fe25735c11a14..b281d5eb02f6d5ee46b3f4155b98c738f05d6640 100644
--- a/paddle/math/Matrix.cpp
+++ b/paddle/math/Matrix.cpp
@@ -2268,7 +2268,7 @@ void CpuMatrix::contextProjectionBackward(Matrix* inputGrad,
 
   int64_t inputDim = inputGrad ? inputGrad->getWidth()
                                : weightGrad ? weightGrad->getWidth() : 0;
-  CHECK_EQ(getWidth(), inputDim * contextLength);
+  CHECK_EQ(getWidth(), static_cast<size_t>(inputDim * contextLength));
 
   const int* starts = sequence.getData();
   size_t numSequences = sequence.getSize() - 1;