diff --git a/paddle/fluid/API.spec b/paddle/fluid/API.spec
index 37c2523c9fea85119ae7e6971e4bc5559ea9b8e8..d21cb2697b3368540ea8ca721a7f9e21e04f3d48 100644
--- a/paddle/fluid/API.spec
+++ b/paddle/fluid/API.spec
@@ -378,7 +378,7 @@ paddle.fluid.LoDTensor.__init__ 1. __init__(self: paddle.fluid.core.LoDTensor, a
 paddle.fluid.LoDTensor.has_valid_recursive_sequence_lengths has_valid_recursive_sequence_lengths(self: paddle.fluid.core.LoDTensor) -> bool
 paddle.fluid.LoDTensor.lod lod(self: paddle.fluid.core.LoDTensor) -> List[List[int]]
 paddle.fluid.LoDTensor.recursive_sequence_lengths recursive_sequence_lengths(self: paddle.fluid.core.LoDTensor) -> List[List[int]]
-paddle.fluid.LoDTensor.set 1. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float32], arg1: paddle::platform::CPUPlace) -> None  2. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int32], arg1: paddle::platform::CPUPlace) -> None  3. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float64], arg1: paddle::platform::CPUPlace) -> None  4. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int64], arg1: paddle::platform::CPUPlace) -> None  5. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[bool], arg1: paddle::platform::CPUPlace) -> None  6. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint16], arg1: paddle::platform::CPUPlace) -> None  7. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint8], arg1: paddle::platform::CPUPlace) -> None  8. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float32], arg1: paddle::platform::CUDAPlace) -> None  9. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int32], arg1: paddle::platform::CUDAPlace) -> None  10. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float64], arg1: paddle::platform::CUDAPlace) -> None  11. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int64], arg1: paddle::platform::CUDAPlace) -> None  12. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[bool], arg1: paddle::platform::CUDAPlace) -> None  13. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint16], arg1: paddle::platform::CUDAPlace) -> None  14. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint8], arg1: paddle::platform::CUDAPlace) -> None  15. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float32], arg1: paddle::platform::CUDAPinnedPlace) -> None  16. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int32], arg1: paddle::platform::CUDAPinnedPlace) -> None  17. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float64], arg1: paddle::platform::CUDAPinnedPlace) -> None  18. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int64], arg1: paddle::platform::CUDAPinnedPlace) -> None  19. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[bool], arg1: paddle::platform::CUDAPinnedPlace) -> None  20. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint16], arg1: paddle::platform::CUDAPinnedPlace) -> None  21. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint8], arg1: paddle::platform::CUDAPinnedPlace) -> None
+paddle.fluid.LoDTensor.set 1. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float32], arg1: paddle::platform::CPUPlace) -> None  2. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int32], arg1: paddle::platform::CPUPlace) -> None  3. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float64], arg1: paddle::platform::CPUPlace) -> None  4. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int64], arg1: paddle::platform::CPUPlace) -> None  5. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[bool], arg1: paddle::platform::CPUPlace) -> None  6. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint16], arg1: paddle::platform::CPUPlace) -> None  7. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint8], arg1: paddle::platform::CPUPlace) -> None  8. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int8], arg1: paddle::platform::CPUPlace) -> None  9. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float32], arg1: paddle::platform::CUDAPlace) -> None  10. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int32], arg1: paddle::platform::CUDAPlace) -> None  11. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float64], arg1: paddle::platform::CUDAPlace) -> None  12. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int64], arg1: paddle::platform::CUDAPlace) -> None  13. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[bool], arg1: paddle::platform::CUDAPlace) -> None  14. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint16], arg1: paddle::platform::CUDAPlace) -> None  15. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint8], arg1: paddle::platform::CUDAPlace) -> None  16. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int8], arg1: paddle::platform::CUDAPlace) -> None  17. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float32], arg1: paddle::platform::CUDAPinnedPlace) -> None  18. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int32], arg1: paddle::platform::CUDAPinnedPlace) -> None  19. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[float64], arg1: paddle::platform::CUDAPinnedPlace) -> None  20. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int64], arg1: paddle::platform::CUDAPinnedPlace) -> None  21. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[bool], arg1: paddle::platform::CUDAPinnedPlace) -> None  22. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint16], arg1: paddle::platform::CUDAPinnedPlace) -> None  23. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[uint8], arg1: paddle::platform::CUDAPinnedPlace) -> None  24. set(self: paddle.fluid.core.Tensor, arg0: numpy.ndarray[int8], arg1: paddle::platform::CUDAPinnedPlace) -> None
 paddle.fluid.LoDTensor.set_lod set_lod(self: paddle.fluid.core.LoDTensor, arg0: List[List[int]]) -> None
 paddle.fluid.LoDTensor.set_recursive_sequence_lengths set_recursive_sequence_lengths(self: paddle.fluid.core.LoDTensor, arg0: List[List[int]]) -> None
 paddle.fluid.LoDTensor.shape shape(self: paddle.fluid.core.Tensor) -> List[int]
diff --git a/paddle/fluid/framework/data_type.cc b/paddle/fluid/framework/data_type.cc
index 1a9ce746ea840bc088d222cc4e9bc05159d64734..28f3da88fa18021f6b71e458fdb467be86d4dbf0 100644
--- a/paddle/fluid/framework/data_type.cc
+++ b/paddle/fluid/framework/data_type.cc
@@ -64,6 +64,7 @@ static DataTypeMap* InitDataTypeMap() {
   RegType(size_t, proto::VarType::SIZE_T);
   RegType(int16_t, proto::VarType::INT16);
   RegType(uint8_t, proto::VarType::UINT8);
+  RegType(int8_t, proto::VarType::INT8);
 
 #undef RegType
   return retv;
diff --git a/paddle/fluid/framework/data_type.h b/paddle/fluid/framework/data_type.h
index f8c72ffc8964e64a10cff04f322f40b39b2fe263..84691a2059124960a3213802fec0863f8abe6df7 100644
--- a/paddle/fluid/framework/data_type.h
+++ b/paddle/fluid/framework/data_type.h
@@ -54,6 +54,9 @@ inline void VisitDataType(proto::VarType::Type type, Visitor visitor) {
     case proto::VarType::INT16:
       visitor.template operator()<int16_t>();
       break;
+    case proto::VarType::INT8:
+      visitor.template operator()<int8_t>();
+      break;
     default:
       PADDLE_THROW("Not supported %d", type);
   }
diff --git a/paddle/fluid/framework/framework.proto b/paddle/fluid/framework/framework.proto
index 2cf14bd371831ab682166f4256d6966b5ab278c8..c6588435819a982166cf2d2368a82b4402fdc2bc 100644
--- a/paddle/fluid/framework/framework.proto
+++ b/paddle/fluid/framework/framework.proto
@@ -107,6 +107,7 @@ message VarType {
     // Tensor<size_t> is used in C++.
     SIZE_T = 19;
     UINT8 = 20;
+    INT8 = 21;
 
     // Other types that may need additional descriptions
     LOD_TENSOR = 7;
diff --git a/paddle/fluid/operators/math/concat.cu b/paddle/fluid/operators/math/concat.cu
index 820e73e779720e4f76168e0a84a254ef645784ee..342379268be36cc5b532363e664f6e73990333e1 100644
--- a/paddle/fluid/operators/math/concat.cu
+++ b/paddle/fluid/operators/math/concat.cu
@@ -177,6 +177,9 @@ class ConcatFunctor<platform::CUDADeviceContext, T> {
           dev_ins_data, dev_ins_col_data, static_cast<int>(inputs_col.size()),
           out_row, out_col, output->data<T>());
     }
+    // Wait() must be called because `inputs_data` may be destructed before
+    // kernel ends
+    context.Wait();
   }
 };
 
@@ -252,6 +255,9 @@ class ConcatGradFunctor<platform::CUDADeviceContext, T> {
           input.data<T>(), in_row, in_col, dev_outs_col_data,
           static_cast<int>(outputs_cols.size()), dev_out_gpu_data);
     }
+    // Wait() must be called because `outputs_data` may be destructed before
+    // kernel ends
+    context.Wait();
   }
 };
 
diff --git a/paddle/fluid/operators/math/math_function.cc b/paddle/fluid/operators/math/math_function.cc
index c3387be6daa3bd34a6e3410ced23fce5d65f2cf7..9a6e646b28fdec78734eb4e7b98c8acf688b2645 100644
--- a/paddle/fluid/operators/math/math_function.cc
+++ b/paddle/fluid/operators/math/math_function.cc
@@ -41,7 +41,8 @@ template struct SetConstant<platform::CPUDeviceContext, uint8_t>;
   template struct Transpose<platform::CPUDeviceContext, int64_t, RANK>;    \
   template struct Transpose<platform::CPUDeviceContext, bool, RANK>;       \
   template struct Transpose<platform::CPUDeviceContext, int16_t, RANK>;    \
-  template struct Transpose<platform::CPUDeviceContext, uint8_t, RANK>;
+  template struct Transpose<platform::CPUDeviceContext, uint8_t, RANK>;    \
+  template struct Transpose<platform::CPUDeviceContext, int8_t, RANK>;
 
 DEFINE_CPU_TRANS(1);
 DEFINE_CPU_TRANS(2);
diff --git a/paddle/fluid/operators/math/math_function.cu b/paddle/fluid/operators/math/math_function.cu
index d5af718723e8d44da0971ea7756b8c36e771cca2..12d1baa8fb544a8b9684e43204c61ba410d1b295 100644
--- a/paddle/fluid/operators/math/math_function.cu
+++ b/paddle/fluid/operators/math/math_function.cu
@@ -33,10 +33,11 @@ template struct SetConstant<platform::CUDADeviceContext, int>;
 template struct SetConstant<platform::CUDADeviceContext, int64_t>;
 template struct SetConstant<platform::CUDADeviceContext, bool>;
 
-#define DEFINE_GPU_TRANS(RANK)                                          \
-  template struct Transpose<platform::CUDADeviceContext, float, RANK>;  \
-  template struct Transpose<platform::CUDADeviceContext, double, RANK>; \
-  template struct Transpose<platform::CUDADeviceContext, float16, RANK>;
+#define DEFINE_GPU_TRANS(RANK)                                           \
+  template struct Transpose<platform::CUDADeviceContext, float, RANK>;   \
+  template struct Transpose<platform::CUDADeviceContext, double, RANK>;  \
+  template struct Transpose<platform::CUDADeviceContext, float16, RANK>; \
+  template struct Transpose<platform::CUDADeviceContext, int8_t, RANK>;
 
 DEFINE_GPU_TRANS(1);
 DEFINE_GPU_TRANS(2);
diff --git a/paddle/fluid/operators/math/padding.h b/paddle/fluid/operators/math/padding.h
new file mode 100644
index 0000000000000000000000000000000000000000..3ae25eae98b25bca015ec4383c7126eb81e52b8a
--- /dev/null
+++ b/paddle/fluid/operators/math/padding.h
@@ -0,0 +1,124 @@
+/* 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. */
+
+#pragma once
+#include <utility>
+#include <vector>
+#include "paddle/fluid/framework/tensor.h"
+
+namespace paddle {
+namespace operators {
+namespace math {
+
+template <typename T, size_t D, int MajorType = Eigen::RowMajor,
+          typename IndexType = Eigen::DenseIndex>
+using EigenTensor = framework::EigenTensor<T, D, MajorType, IndexType>;
+
+template <typename DeviceContext, typename T, size_t D>
+void PadFunction(const framework::ExecutionContext& context,
+                 const std::vector<int>& pads, const framework::Tensor& src,
+                 T pad_value, framework::Tensor* out) {
+  Eigen::array<std::pair<int, int>, D> paddings;
+
+  for (size_t i = 0; i < paddings.size(); ++i) {
+    paddings[i].first = pads[i * 2];
+    paddings[i].second = pads[i * 2 + 1];
+  }
+
+  auto src_tensor = EigenTensor<T, D>::From(src);
+  auto out_tensor = EigenTensor<T, D>::From(*out);
+
+  auto& place =
+      *context.template device_context<DeviceContext>().eigen_device();
+  out_tensor.device(place) = src_tensor.pad(paddings, pad_value);
+}
+
+template <typename DeviceContext, typename T, size_t D>
+void PadGradFunction(const framework::ExecutionContext& context,
+                     const std::vector<int>& pads, const framework::Tensor& src,
+                     framework::Tensor* d_out) {
+  Eigen::array<std::pair<int, int>, D> paddings;
+  for (size_t i = 0; i < paddings.size(); ++i) {
+    paddings[i].first = -pads[i * 2];
+    paddings[i].second = -pads[i * 2 + 1];
+  }
+
+  auto d_out_tensor = EigenTensor<T, D>::From(*d_out);
+  auto src_tensor = EigenTensor<T, D>::From(src);
+  auto& place =
+      *context.template device_context<DeviceContext>().eigen_device();
+  d_out_tensor.device(place) = src_tensor.pad(paddings, 0);
+}
+
+template <typename DeviceContext, typename T>
+void PaddingFunctor(int rank, const framework::ExecutionContext& context,
+                    const std::vector<int>& pads, T pad_value,
+                    const framework::Tensor& src, framework::Tensor* out) {
+  switch (rank) {
+    case 1:
+      PadFunction<DeviceContext, T, 1>(context, pads, src, pad_value, out);
+      break;
+    case 2:
+      PadFunction<DeviceContext, T, 2>(context, pads, src, pad_value, out);
+      break;
+    case 3:
+      PadFunction<DeviceContext, T, 3>(context, pads, src, pad_value, out);
+      break;
+    case 4:
+      PadFunction<DeviceContext, T, 4>(context, pads, src, pad_value, out);
+      break;
+    case 5:
+      PadFunction<DeviceContext, T, 5>(context, pads, src, pad_value, out);
+      break;
+    case 6:
+      PadFunction<DeviceContext, T, 6>(context, pads, src, pad_value, out);
+      break;
+    default:
+      PADDLE_THROW(
+          "PadOp only support tensors with no more than 6 dimensions.");
+  }
+}
+
+template <typename DeviceContext, typename T>
+void PaddingGradFunctor(int rank, const framework::ExecutionContext& context,
+                        const std::vector<int>& pads,
+                        const framework::Tensor& src, framework::Tensor* out) {
+  switch (rank) {
+    case 1:
+      PadGradFunction<DeviceContext, T, 1>(context, pads, src, out);
+      break;
+    case 2:
+      PadGradFunction<DeviceContext, T, 2>(context, pads, src, out);
+      break;
+    case 3:
+      PadGradFunction<DeviceContext, T, 3>(context, pads, src, out);
+      break;
+    case 4:
+      PadGradFunction<DeviceContext, T, 4>(context, pads, src, out);
+      break;
+    case 5:
+      PadGradFunction<DeviceContext, T, 5>(context, pads, src, out);
+      break;
+    case 6:
+      PadGradFunction<DeviceContext, T, 6>(context, pads, src, out);
+      break;
+    default:
+      PADDLE_THROW(
+          "PadOp only support tensors with no more than 6 dimensions.");
+  }
+}
+
+}  // namespace math
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/fluid/operators/pad_constant_like_op.cc b/paddle/fluid/operators/pad_constant_like_op.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5958811d38f4f772264d2c837c42a704062649f7
--- /dev/null
+++ b/paddle/fluid/operators/pad_constant_like_op.cc
@@ -0,0 +1,196 @@
+/* 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 "paddle/fluid/operators/pad_constant_like_op.h"
+
+namespace paddle {
+namespace operators {
+
+using framework::Tensor;
+
+class PadConstantLikeOp : public framework::OperatorWithKernel {
+ public:
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext *ctx) const override {
+    PADDLE_ENFORCE(ctx->HasInput("X"),
+                   "Input(X) of PadConstantLikeOp should not be null.");
+    PADDLE_ENFORCE(ctx->HasInput("Y"),
+                   "Input(Y) of PadConstantLikeOp should not be null.");
+    PADDLE_ENFORCE(ctx->HasOutput("Out"),
+                   "Output(Out) of PadConstantLikeOp should not be null.");
+
+    auto x_dim = ctx->GetInputDim("X");
+    auto y_dim = ctx->GetInputDim("Y");
+
+    PADDLE_ENFORCE_EQ(x_dim.size(), y_dim.size(),
+                      "The dimention of X and Y should be the same.");
+
+    for (int i = 0; i < x_dim.size(); ++i) {
+      PADDLE_ENFORCE_GE(x_dim[i], y_dim[i]);
+    }
+    ctx->SetOutputDim("Out", x_dim);
+    ctx->ShareLoD("X", /*->*/ "Out");
+  }
+};
+
+class PadConstantLikeOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  void Make() override {
+    AddInput("X",
+             "The input of pad_constant_like op. "
+             "The input should be a k-D tensor(k > 0 and k < 7)");
+    AddInput("Y",
+             "The input of pad_constant_like op. "
+             "The input should be a k-D tensor(k > 0 and k < 7)");
+    AddOutput("Out",
+              "The output of pad_constant_like op. "
+              "A tensor with the same shape as X.");
+    AddAttr<float>("pad_value",
+                   "(float, default 0.0) "
+                   "The value to fill the padded areas.")
+        .SetDefault(0.0f);
+    AddComment(R"DOC(
+PadConstantLikeOp Operator.
+
+Pad input(Y) with a pad_value, the number of values padded to the edges of each
+axis is specified by the difference of the shape of X and Y.
+((0, shape_x_0 - shape_y_0), … (0, shape_x_n - shape_y_n)) unique pad widths for
+each axis.
+The input should be a k-D tensor(k > 0 and k < 7). As an example:
+
+case1:
+    Given:
+        X = [[1, 2],
+             [3, 4],
+             [1, 2],
+             [3, 4]]],
+        X.shape = (4, 2)
+
+        Y = [[5, 6],
+            [7, 8]],
+        Y.shape = (2, 2)
+
+    And
+        pad_value = 0,
+
+    Return:
+        Out = [[5, 6],
+               [7, 8],
+               [0, 0],
+               [0, 0]]
+        Out.shape = (4, 2)
+
+case2:
+    Given:
+        X = [[[[ 0,  1,  2],
+               [ 3,  4,  5]],
+              [[ 6,  7,  8],
+               [ 9, 10, 11]],
+              [[12, 13, 14],
+               [15, 16, 17]]],
+             [[[18, 19, 20],
+               [21, 22, 23]],
+              [[24, 25, 26],
+               [27, 28, 29]],
+              [[30, 31, 32],
+               [33, 34, 35]]]]
+        X.shape = (2, 3, 2, 3)
+
+        Y = [[[[35, 36, 37]],
+              [[38, 39, 40]],
+              [[41, 42, 43]]]]
+        Y.shape = (1, 3, 1, 3)
+
+    And
+        pad_value = -1,
+
+    Return:
+
+        Out = [[[[35, 36, 37],
+                 [-1, -1, -1]],
+                [[38, 39, 40],
+                 [-1, -1, -1]],
+                [[41, 42, 43],
+                 [-1, -1, -1]]],
+               [[[-1, -1, -1],
+                 [-1, -1, -1]],
+                [[-1, -1, -1],
+                 [-1, -1, -1]],
+                [[-1, -1, -1],
+                 [-1, -1, -1]]]]
+        Out.shape = (2, 3, 2, 3)
+)DOC");
+  }
+};
+
+class PadConstantLikeOpGrad : public framework::OperatorWithKernel {
+ public:
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext *ctx) const override {
+    PADDLE_ENFORCE(ctx->HasInput("Y"), "Input(Y) should not be null");
+    PADDLE_ENFORCE(ctx->HasInput(framework::GradVarName("Out")),
+                   "Input(Out@GRAD) should not be null");
+    auto y_dim = ctx->GetInputDim("Y");
+    auto dout_dim = ctx->GetInputDim(framework::GradVarName("Out"));
+
+    PADDLE_ENFORCE_EQ(dout_dim.size(), y_dim.size(),
+                      "The dimention of X and Y should be the same.");
+
+    auto y_grad_name = framework::GradVarName("Y");
+    if (ctx->HasOutput(y_grad_name)) {
+      ctx->SetOutputDim(y_grad_name, y_dim);
+      ctx->ShareLoD("Y", /*->*/ y_grad_name);
+
+      for (int i = 0; i < y_dim.size(); ++i) {
+        PADDLE_ENFORCE_GE(dout_dim[i], y_dim[i]);
+      }
+    }
+  }
+};
+
+class PadConstantLikeOpGradMaker : public framework::SingleGradOpDescMaker {
+ public:
+  using framework::SingleGradOpDescMaker::SingleGradOpDescMaker;
+
+ protected:
+  std::unique_ptr<framework::OpDesc> Apply() const override {
+    auto *bind = new framework::OpDesc();
+    bind->SetType("pad_constant_like_grad");
+    bind->SetInput("Y", Input("Y"));
+    bind->SetInput(framework::GradVarName("Out"), OutputGrad("Out"));
+    bind->SetOutput(framework::GradVarName("Y"), InputGrad("Y"));
+    bind->SetAttrMap(Attrs());
+    return std::unique_ptr<framework::OpDesc>(bind);
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+
+REGISTER_OPERATOR(pad_constant_like, ops::PadConstantLikeOp,
+                  ops::PadConstantLikeOpMaker, ops::PadConstantLikeOpGradMaker);
+REGISTER_OPERATOR(pad_constant_like_grad, ops::PadConstantLikeOpGrad);
+
+REGISTER_OP_CPU_KERNEL(
+    pad_constant_like,
+    ops::PadConstantLikeKernel<paddle::platform::CPUDeviceContext, float>,
+    ops::PadConstantLikeKernel<paddle::platform::CPUDeviceContext, double>);
+REGISTER_OP_CPU_KERNEL(
+    pad_constant_like_grad,
+    ops::PadConstantLikeGradKernel<paddle::platform::CPUDeviceContext, float>,
+    ops::PadConstantLikeGradKernel<paddle::platform::CPUDeviceContext, double>);
diff --git a/paddle/fluid/operators/pad_constant_like_op.cu b/paddle/fluid/operators/pad_constant_like_op.cu
new file mode 100644
index 0000000000000000000000000000000000000000..ea69577904577de353b63491973bf74b7724e18e
--- /dev/null
+++ b/paddle/fluid/operators/pad_constant_like_op.cu
@@ -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. */
+
+#define EIGEN_USE_GPU
+#include "paddle/fluid/operators/pad_constant_like_op.h"
+
+namespace ops = paddle::operators;
+REGISTER_OP_CUDA_KERNEL(
+    pad_constant_like,
+    ops::PadConstantLikeKernel<paddle::platform::CUDADeviceContext, float>,
+    ops::PadConstantLikeKernel<paddle::platform::CUDADeviceContext, double>);
+REGISTER_OP_CUDA_KERNEL(
+    pad_constant_like_grad,
+    ops::PadConstantLikeGradKernel<paddle::platform::CUDADeviceContext, float>,
+    ops::PadConstantLikeGradKernel<paddle::platform::CUDADeviceContext,
+                                   double>);
diff --git a/paddle/fluid/operators/pad_constant_like_op.h b/paddle/fluid/operators/pad_constant_like_op.h
new file mode 100644
index 0000000000000000000000000000000000000000..01d66901afc49a487c344b039b65f547967e95ff
--- /dev/null
+++ b/paddle/fluid/operators/pad_constant_like_op.h
@@ -0,0 +1,93 @@
+/* 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. */
+
+#pragma once
+
+#include <utility>
+#include <vector>
+#include "paddle/fluid/framework/eigen.h"
+#include "paddle/fluid/framework/op_registry.h"
+#include "paddle/fluid/framework/tensor.h"
+#include "paddle/fluid/framework/tensor_util.h"
+#include "paddle/fluid/operators/math/padding.h"
+
+namespace paddle {
+namespace operators {
+
+template <typename DeviceContext, typename T>
+class PadConstantLikeKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& context) const override {
+    auto in_x = context.Input<framework::Tensor>("X");
+    auto in_y = context.Input<framework::Tensor>("Y");
+    auto* out = context.Output<framework::Tensor>("Out");
+
+    if (in_x->dims() == in_y->dims()) {
+      // TensorCopy(in_y, context.GetPlace(), context, out);
+      out->ShareDataWith(*in_y);
+      return;
+    }
+
+    T pad_value = context.Attr<T>("pad_value");
+    out->mutable_data<T>(context.GetPlace());
+
+    int rank = context.Input<framework::Tensor>("X")->dims().size();
+
+    std::vector<int> pads(rank * 2, 0);
+
+    for (int j = 0; j < rank; ++j) {
+      pads[j * 2] = 0;
+      pads[j * 2 + 1] = static_cast<int>(in_x->dims()[j] - in_y->dims()[j]);
+    }
+
+    math::PaddingFunctor<DeviceContext, T>(rank, context, pads, pad_value,
+                                           *in_y, out);
+  }
+};
+
+template <typename DeviceContext, typename T>
+class PadConstantLikeGradKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& context) const override {
+    auto in_y = context.Input<framework::Tensor>("Y");
+    auto in_dout =
+        context.Input<framework::Tensor>(framework::GradVarName("Out"));
+    auto* d_y = context.Output<framework::Tensor>(framework::GradVarName("Y"));
+
+    if (d_y == nullptr) {
+      return;
+    }
+
+    if (in_dout->dims() == in_y->dims()) {
+      // TensorCopy(in_dout, context.GetPlace(), context, d_y);
+      d_y->ShareDataWith(*in_dout);
+      return;
+    }
+
+    d_y->mutable_data<T>(context.GetPlace());
+    int rank = in_dout->dims().size();
+
+    std::vector<int> pads(static_cast<size_t>(rank) * 2, 0);
+    for (int j = 0; j < rank; ++j) {
+      pads[j * 2] = 0;
+      pads[j * 2 + 1] = static_cast<int>(in_dout->dims()[j] - in_y->dims()[j]);
+    }
+
+    math::PaddingGradFunctor<DeviceContext, T>(rank, context, pads, *in_dout,
+                                               d_y);
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
diff --git a/paddle/fluid/operators/pad_op.h b/paddle/fluid/operators/pad_op.h
index c93c096575a30dd9344894ead4b81acc16930e21..32698dac4917e183cfe36c831787b049985b19b3 100644
--- a/paddle/fluid/operators/pad_op.h
+++ b/paddle/fluid/operators/pad_op.h
@@ -18,117 +18,44 @@ limitations under the License. */
 #include <vector>
 #include "paddle/fluid/framework/eigen.h"
 #include "paddle/fluid/framework/op_registry.h"
+#include "paddle/fluid/operators/math/padding.h"
 
 namespace paddle {
 namespace operators {
 
 using Tensor = framework::Tensor;
 
-template <typename T, size_t D, int MajorType = Eigen::RowMajor,
-          typename IndexType = Eigen::DenseIndex>
-using EigenTensor = framework::EigenTensor<T, D, MajorType, IndexType>;
-
-template <typename DeviceContext, typename T, size_t D>
-void PadFunction(const framework::ExecutionContext& context) {
-  auto pads = context.Attr<std::vector<int>>("paddings");
-  Eigen::array<std::pair<int, int>, D> paddings;
-  for (size_t i = 0; i < paddings.size(); ++i) {
-    paddings[i].first = pads[i * 2];
-    paddings[i].second = pads[i * 2 + 1];
-  }
-  T pad_value = context.Attr<T>("pad_value");
-
-  auto* x = context.Input<Tensor>("X");
-  auto* out = context.Output<Tensor>("Out");
-  out->mutable_data<T>(context.GetPlace());
-
-  auto x_tensor = EigenTensor<T, D>::From(*x);
-  auto out_tensor = EigenTensor<T, D>::From(*out);
-  auto& place =
-      *context.template device_context<DeviceContext>().eigen_device();
-  out_tensor.device(place) = x_tensor.pad(paddings, pad_value);
-}
-
 template <typename DeviceContext, typename T>
 class PadKernel : public framework::OpKernel<T> {
  public:
   void Compute(const framework::ExecutionContext& context) const override {
-    int rank = context.Input<Tensor>("X")->dims().size();
-    switch (rank) {
-      case 1:
-        PadFunction<DeviceContext, T, 1>(context);
-        break;
-      case 2:
-        PadFunction<DeviceContext, T, 2>(context);
-        break;
-      case 3:
-        PadFunction<DeviceContext, T, 3>(context);
-        break;
-      case 4:
-        PadFunction<DeviceContext, T, 4>(context);
-        break;
-      case 5:
-        PadFunction<DeviceContext, T, 5>(context);
-        break;
-      case 6:
-        PadFunction<DeviceContext, T, 6>(context);
-        break;
-      default:
-        PADDLE_THROW(
-            "PadOp only support tensors with no more than 6 dimensions.");
-    }
+    auto pads = context.Attr<std::vector<int>>("paddings");
+    T pad_value = context.Attr<T>("pad_value");
+    auto* x = context.Input<Tensor>("X");
+    auto* out = context.Output<Tensor>("Out");
+    out->mutable_data<T>(context.GetPlace());
+
+    int rank = x->dims().size();
+    math::PaddingFunctor<DeviceContext, T>(rank, context, pads, pad_value, *x,
+                                           out);
   }
 };
 
-template <typename DeviceContext, typename T, size_t D>
-void PadGradFunction(const framework::ExecutionContext& context) {
-  auto pads = context.Attr<std::vector<int>>("paddings");
-  Eigen::array<std::pair<int, int>, D> paddings;
-  for (size_t i = 0; i < paddings.size(); ++i) {
-    paddings[i].first = -pads[i * 2];
-    paddings[i].second = -pads[i * 2 + 1];
-  }
-  auto* d_out = context.Input<Tensor>(framework::GradVarName("Out"));
-  auto* d_x = context.Output<Tensor>(framework::GradVarName("X"));
-  if (d_x != nullptr) {
-    d_x->mutable_data<T>(context.GetPlace());
-    auto d_x_tensor = EigenTensor<T, D>::From(*d_x);
-    auto d_out_tensor = EigenTensor<T, D>::From(*d_out);
-    auto& place =
-        *context.template device_context<DeviceContext>().eigen_device();
-    d_x_tensor.device(place) = d_out_tensor.pad(paddings, 0);
-  }
-}
-
 template <typename DeviceContext, typename T>
 class PadGradKernel : public framework::OpKernel<T> {
  public:
   void Compute(const framework::ExecutionContext& context) const override {
-    size_t rank =
-        context.Input<Tensor>(framework::GradVarName("Out"))->dims().size();
-    switch (rank) {
-      case 1:
-        PadGradFunction<DeviceContext, T, 1>(context);
-        break;
-      case 2:
-        PadGradFunction<DeviceContext, T, 2>(context);
-        break;
-      case 3:
-        PadGradFunction<DeviceContext, T, 3>(context);
-        break;
-      case 4:
-        PadGradFunction<DeviceContext, T, 4>(context);
-        break;
-      case 5:
-        PadGradFunction<DeviceContext, T, 5>(context);
-        break;
-      case 6:
-        PadGradFunction<DeviceContext, T, 6>(context);
-        break;
-      default:
-        PADDLE_THROW(
-            "PadOp only support tensors with no more than 6 dimensions.");
+    auto pads = context.Attr<std::vector<int>>("paddings");
+    auto* d_out = context.Input<Tensor>(framework::GradVarName("Out"));
+    auto* d_x = context.Output<Tensor>(framework::GradVarName("X"));
+    if (d_x == nullptr) {
+      return;
     }
+
+    d_x->mutable_data<T>(context.GetPlace());
+    int rank = d_out->dims().size();
+    math::PaddingGradFunctor<DeviceContext, T>(rank, context, pads, *d_out,
+                                               d_x);
   }
 };
 
diff --git a/paddle/fluid/pybind/protobuf.cc b/paddle/fluid/pybind/protobuf.cc
index c2137ec6d7df24251432a4dfb8fffc3d3f77194e..f21f8d23f99c27529b2ed1995c92fd4eee4a5807 100644
--- a/paddle/fluid/pybind/protobuf.cc
+++ b/paddle/fluid/pybind/protobuf.cc
@@ -234,6 +234,7 @@ void BindVarDsec(pybind11::module *m) {
   pybind11::enum_<pd::proto::VarType::Type>(var_desc, "VarType", "")
       .value("BOOL", pd::proto::VarType::BOOL)
       .value("UINT8", pd::proto::VarType::UINT8)
+      .value("INT8", pd::proto::VarType::INT8)
       .value("INT16", pd::proto::VarType::INT16)
       .value("INT32", pd::proto::VarType::INT32)
       .value("INT64", pd::proto::VarType::INT64)
diff --git a/paddle/fluid/pybind/pybind.cc b/paddle/fluid/pybind/pybind.cc
index 67734659233515ca8110f4212a2b1553fe4e9d24..5b20b87174e42f4dfdd22214e8f9dd20c7296374 100644
--- a/paddle/fluid/pybind/pybind.cc
+++ b/paddle/fluid/pybind/pybind.cc
@@ -130,6 +130,7 @@ PYBIND11_PLUGIN(core) {
       .def("set", PyCPUTensorSetFromArray<bool>)
       .def("set", PyCPUTensorSetFromArray<uint16_t>)
       .def("set", PyCPUTensorSetFromArray<uint8_t>)
+      .def("set", PyCPUTensorSetFromArray<int8_t>)
 #ifdef PADDLE_WITH_CUDA
       .def("set", PyCUDATensorSetFromArray<float>)
       .def("set", PyCUDATensorSetFromArray<int>)
@@ -138,6 +139,7 @@ PYBIND11_PLUGIN(core) {
       .def("set", PyCUDATensorSetFromArray<bool>)
       .def("set", PyCUDATensorSetFromArray<uint16_t>)
       .def("set", PyCUDATensorSetFromArray<uint8_t>)
+      .def("set", PyCUDATensorSetFromArray<int8_t>)
       .def("set", PyCUDAPinnedTensorSetFromArray<float>)
       .def("set", PyCUDAPinnedTensorSetFromArray<int>)
       .def("set", PyCUDAPinnedTensorSetFromArray<double>)
@@ -145,6 +147,7 @@ PYBIND11_PLUGIN(core) {
       .def("set", PyCUDAPinnedTensorSetFromArray<bool>)
       .def("set", PyCUDAPinnedTensorSetFromArray<uint16_t>)
       .def("set", PyCUDAPinnedTensorSetFromArray<uint8_t>)
+      .def("set", PyCUDAPinnedTensorSetFromArray<int8_t>)
 #endif
       .def("shape", [](Tensor &self) { return vectorize(self.dims()); })
       .def("_set_float_element", TensorSetElement<float>)
diff --git a/paddle/fluid/pybind/tensor_py.h b/paddle/fluid/pybind/tensor_py.h
index 3e2ea1ef88b03f5b2576c1cee2b5d26a439943da..51614a6a3dd2f7f830cf533fc365b56a99d3b918 100644
--- a/paddle/fluid/pybind/tensor_py.h
+++ b/paddle/fluid/pybind/tensor_py.h
@@ -97,7 +97,7 @@ struct CastToPyBufferImpl<true, I, ARGS...> {
 inline pybind11::buffer_info CastToPyBuffer(const framework::Tensor &tensor) {
   auto buffer_info =
       details::CastToPyBufferImpl<true, 0, float, int, double, int64_t, bool,
-                                  uint8_t, platform::float16>()(tensor);
+                                  uint8_t, int8_t, platform::float16>()(tensor);
   return buffer_info;
 }
 
diff --git a/python/paddle/fluid/framework.py b/python/paddle/fluid/framework.py
index febb750ee1af26c71e6c1ae1e4c97fb02fb27a04..fbe766336b19719b7a3eac41ad5e877ef3ec4181 100644
--- a/python/paddle/fluid/framework.py
+++ b/python/paddle/fluid/framework.py
@@ -95,6 +95,8 @@ def convert_np_dtype_to_dtype_(np_dtype):
         return core.VarDesc.VarType.INT16
     elif dtype == np.uint8:
         return core.VarDesc.VarType.UINT8
+    elif dtype == np.int8:
+        return core.VarDesc.VarType.INT8
     else:
         raise ValueError("Not supported numpy dtype %s" % dtype)
 
diff --git a/python/paddle/fluid/tests/unittests/test_pad_constant_like.py b/python/paddle/fluid/tests/unittests/test_pad_constant_like.py
new file mode 100644
index 0000000000000000000000000000000000000000..6b733fd8fa023f07013909502dbbd5371297216e
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/test_pad_constant_like.py
@@ -0,0 +1,69 @@
+#   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.
+
+from __future__ import print_function
+
+import unittest
+import numpy as np
+from op_test import OpTest
+
+
+class TestPadOp(OpTest):
+    def setUp(self):
+        self.initTestCase()
+        self.op_type = "pad_constant_like"
+        self.inputs = {
+            'X': np.random.random(self.x_shape).astype("float32"),
+            'Y': np.random.random(self.y_shape).astype("float32")
+        }
+        self.attrs = {}
+        self.attrs['pad_value'] = self.pad_value
+        self.outputs = {
+            'Out': np.pad(self.inputs['Y'],
+                          self.paddings,
+                          mode='constant',
+                          constant_values=self.pad_value)
+        }
+
+    def test_check_output(self):
+        self.check_output()
+
+    def test_check_grad_normal(self):
+        self.check_grad(['Y'], 'Out', max_relative_error=0.006)
+
+    def initTestCase(self):
+        self.x_shape = (16, 16)
+        self.y_shape = (3, 16)
+        self.pad_value = 0.1
+        self.paddings = [(0, 13), (0, 0)]
+
+
+class TestCase1(TestPadOp):
+    def initTestCase(self):
+        self.x_shape = (4, 3, 4, 4)
+        self.y_shape = (2, 3, 4, 4)
+        self.paddings = [(0, 2), (0, 0), (0, 0), (0, 0)]
+        self.pad_value = 0.5
+
+
+class TestCase2(TestPadOp):
+    def initTestCase(self):
+        self.x_shape = (4, 3, 4, 4)
+        self.y_shape = (2, 3, 2, 4)
+        self.paddings = [(0, 2), (0, 0), (0, 2), (0, 0)]
+        self.pad_value = 0.5
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/python/paddle/fluid/tests/unittests/test_tensor.py b/python/paddle/fluid/tests/unittests/test_tensor.py
index e9d0f8a0193c77da33a8cf128dbf8a1c5087782b..1822957c23d0bb1e4821373515d4faef2b76950e 100644
--- a/python/paddle/fluid/tests/unittests/test_tensor.py
+++ b/python/paddle/fluid/tests/unittests/test_tensor.py
@@ -59,6 +59,27 @@ class TestTensor(unittest.TestCase):
         self.assertAlmostEqual(1.0, tensor_array_2[3, 9])
         self.assertAlmostEqual(2.0, tensor_array_2[19, 11])
 
+    def test_int8_tensor(self):
+        scope = core.Scope()
+        var = scope.var("int8_tensor")
+        cpu_tensor = var.get_tensor()
+        tensor_array = numpy.random.randint(
+            -127, high=128, size=[100, 200], dtype=numpy.int8)
+        place = core.CPUPlace()
+        cpu_tensor.set(tensor_array, place)
+        cpu_tensor_array_2 = numpy.array(cpu_tensor)
+        self.assertAlmostEqual(cpu_tensor_array_2.all(), tensor_array.all())
+
+        if core.is_compiled_with_cuda():
+            cuda_tensor = var.get_tensor()
+            tensor_array = numpy.random.randint(
+                -127, high=128, size=[100, 200], dtype=numpy.int8)
+            place = core.CUDAPlace(0)
+            cuda_tensor.set(tensor_array, place)
+            cuda_tensor_array_2 = numpy.array(cuda_tensor)
+            self.assertAlmostEqual(cuda_tensor_array_2.all(),
+                                   tensor_array.all())
+
     def test_int_lod_tensor(self):
         place = core.CPUPlace()
         scope = core.Scope()
diff --git a/python/paddle/fluid/tests/unittests/test_variable.py b/python/paddle/fluid/tests/unittests/test_variable.py
index b0830e130dd9a9037f8dd900a256eea3d05f64b8..4f3c26ca7bdf4d807952b413c8b0dc8b211c06f6 100644
--- a/python/paddle/fluid/tests/unittests/test_variable.py
+++ b/python/paddle/fluid/tests/unittests/test_variable.py
@@ -31,7 +31,8 @@ class TestVariable(unittest.TestCase):
         self.assertEqual(DT.INT16, convert("int16"))
         self.assertEqual(DT.INT64, convert("int64"))
         self.assertEqual(DT.BOOL, convert("bool"))
-        self.assertRaises(ValueError, lambda: convert("int8"))
+        self.assertEqual(DT.INT8, convert("int8"))
+        self.assertEqual(DT.UINT8, convert("uint8"))
 
     def test_var(self):
         b = default_main_program().current_block()