diff --git a/paddle/fluid/framework/ir/attention_lstm_fuse_pass.cc b/paddle/fluid/framework/ir/attention_lstm_fuse_pass.cc
index 1c75cb5a82029b6a542a3a2f031a353f5e40f4ea..6090f1fe76a49dddad0640123b1fa4db8c489634 100644
--- a/paddle/fluid/framework/ir/attention_lstm_fuse_pass.cc
+++ b/paddle/fluid/framework/ir/attention_lstm_fuse_pass.cc
@@ -262,7 +262,7 @@ std::unique_ptr<ir::Graph> AttentionLSTMFusePass::ApplyImpl(
   std::unordered_set<std::string> specified_vars({"data_lod_attention",
                                                   "cell_init", "hidden_init",
                                                   "data", "week", "minute"});
-  int count = 0;
+  size_t count = 0;
   for (auto* node : graph->Nodes()) {
     if (node->IsVar() && specified_vars.count(node->Name())) {
       ++count;
diff --git a/paddle/fluid/framework/program_desc.cc b/paddle/fluid/framework/program_desc.cc
index 589905828f7793c614c0fe12259e9ba5ab11ceac..4b9667113bc7918c1323f0213213a6ffdb7eed8e 100644
--- a/paddle/fluid/framework/program_desc.cc
+++ b/paddle/fluid/framework/program_desc.cc
@@ -126,7 +126,7 @@ const std::vector<std::string> ProgramDesc::GetFeedTargetNames() {
   std::vector<std::string> feed_target_names;
   for (auto *op : global_block.AllOps()) {
     if (op->Type() == kFeedOpType) {
-      int col = boost::get<int>(op->GetAttr("col"));
+      size_t col = boost::get<int>(op->GetAttr("col"));
       if (col >= feed_target_names.size()) {
         feed_target_names.resize(col + 1);
       }
@@ -143,7 +143,7 @@ const std::vector<std::string> ProgramDesc::GetFetchTargetNames() {
   std::vector<std::string> fetch_target_names;
   for (auto *op : global_block.AllOps()) {
     if (op->Type() == kFetchOpType) {
-      int col = boost::get<int>(op->GetAttr("col"));
+      size_t col = boost::get<int>(op->GetAttr("col"));
       if (col >= fetch_target_names.size()) {
         fetch_target_names.resize(col + 1);
       }
diff --git a/paddle/fluid/framework/reader_test.cc b/paddle/fluid/framework/reader_test.cc
index f0d07cb7c1367576084b9494e7758103bb45d1e5..50aca4b5a4ba7a93a1584a03cc16fe5d712a32b5 100644
--- a/paddle/fluid/framework/reader_test.cc
+++ b/paddle/fluid/framework/reader_test.cc
@@ -39,7 +39,7 @@ TEST(READER, decorate_chain) {
   {
     auto endpoints = root->GetEndPoints();
     ASSERT_EQ(endpoints.size(), 2U);
-    ASSERT_NE(endpoints.count(end_point1.get()), 0);
+    ASSERT_NE(endpoints.count(end_point1.get()), 0UL);
     ASSERT_NE(endpoints.count(end_point2.get()), 0);
   }
 
diff --git a/paddle/fluid/framework/selected_rows_test.cc b/paddle/fluid/framework/selected_rows_test.cc
index 928e1ad8b9168e61ddc5782066a4aa29a4296a94..9c427a4ae4c9660b107ca891a60db306cb09301f 100644
--- a/paddle/fluid/framework/selected_rows_test.cc
+++ b/paddle/fluid/framework/selected_rows_test.cc
@@ -91,7 +91,7 @@ TEST(SelectedRows, SparseTable) {
   ASSERT_TRUE(table.HasKey(10));
   ASSERT_TRUE(table.HasKey(8));
   ASSERT_TRUE(table.HasKey(6));
-  ASSERT_EQ(table.rows().size(), 3);
+  ASSERT_EQ(table.rows().size(), 3UL);
 
   framework::Tensor ids;
   ids.Resize(framework::make_ddim({4}));
diff --git a/paddle/fluid/operators/reader/reader_blocking_queue_test.cc b/paddle/fluid/operators/reader/reader_blocking_queue_test.cc
index bd7ac64b2fce2452744e4756b149ee7f291d38aa..8cd505806056f1af33712e2c92b7661d87485708 100644
--- a/paddle/fluid/operators/reader/reader_blocking_queue_test.cc
+++ b/paddle/fluid/operators/reader/reader_blocking_queue_test.cc
@@ -229,7 +229,7 @@ TEST(BlockingQueue, speed_test_mode) {
     q1.Receive(&b);
     EXPECT_EQ(b, i);
   }
-  EXPECT_EQ(q1.Size(), 0);
+  EXPECT_EQ(q1.Size(), 0UL);
 
   BlockingQueue<size_t> q2(queue_size, true);
   for (size_t i = 0; i < queue_size; ++i) {
diff --git a/paddle/fluid/operators/sequence_unpad_op.cc b/paddle/fluid/operators/sequence_unpad_op.cc
index f3a0762b9a4d3e080d5d6d10b249e0bd81980b95..e633e378a226ece8adea2e150cc6c1e9aa874331 100644
--- a/paddle/fluid/operators/sequence_unpad_op.cc
+++ b/paddle/fluid/operators/sequence_unpad_op.cc
@@ -50,7 +50,7 @@ class SequenceUnpadOp : public framework::OperatorWithKernel {
     if (x_dims.size() == 2) {
       out_dims_vec.push_back(1);
     } else {
-      for (size_t i = 2; i < x_dims.size(); ++i) {
+      for (int i = 2; i < x_dims.size(); ++i) {
         out_dims_vec.push_back(x_dims[i]);
       }
     }
diff --git a/paddle/fluid/operators/sequence_unpad_op.h b/paddle/fluid/operators/sequence_unpad_op.h
index ebe3118b985bdfd41ca55e8c572047aa87502ff4..07df3dca831d7e646050ae57402c1a493c2e50e9 100644
--- a/paddle/fluid/operators/sequence_unpad_op.h
+++ b/paddle/fluid/operators/sequence_unpad_op.h
@@ -61,7 +61,7 @@ class SequenceUnpadOpKernel : public framework::OpKernel<T> {
     if (x_t->dims().size() == 2) {
       out_dims_vec.push_back(1);
     } else {
-      for (size_t i = 2; i < x_t->dims().size(); ++i) {
+      for (int i = 2; i < x_t->dims().size(); ++i) {
         out_dims_vec.push_back(x_t->dims()[i]);
       }
     }