diff --git a/paddle/fluid/pybind/inference_api.cc b/paddle/fluid/pybind/inference_api.cc
index 6b3b65857341ba7fe811730c4f77fde86f91d181..80f316aed7c8b814739e997c8808539b5322117f 100644
--- a/paddle/fluid/pybind/inference_api.cc
+++ b/paddle/fluid/pybind/inference_api.cc
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 #include "paddle/fluid/pybind/inference_api.h"
-#include <pybind11/numpy.h>
 #include <pybind11/stl.h>
 #include <cstring>
 #include <iostream>
@@ -21,7 +20,6 @@
 #include <memory>
 #include <string>
 #include <unordered_set>
-#include <utility>
 #include <vector>
 #include "paddle/fluid/inference/api/analysis_predictor.h"
 #include "paddle/fluid/inference/api/paddle_inference_api.h"
@@ -53,81 +51,6 @@ void BindAnalysisPredictor(py::module *m);
 #ifdef PADDLE_WITH_MKLDNN
 void BindMkldnnQuantizerConfig(py::module *m);
 #endif
-
-template <typename T>
-PaddleBuf PaddleBufCreate(py::array_t<T> data) {
-  PaddleBuf buf(data.size() * sizeof(T));
-  std::copy_n(static_cast<T *>(data.mutable_data()), data.size(),
-              static_cast<T *>(buf.data()));
-  return buf;
-}
-
-template <typename T>
-void PaddleBufReset(PaddleBuf &buf, py::array_t<T> data) {  // NOLINT
-  buf.Resize(data.size() * sizeof(T));
-  std::copy_n(static_cast<T *>(data.mutable_data()), data.size(),
-              static_cast<T *>(buf.data()));
-}
-
-template <typename T>
-PaddleDType PaddleTensorGetDType();
-
-template <>
-PaddleDType PaddleTensorGetDType<int32_t>() {
-  return PaddleDType::INT32;
-}
-
-template <>
-PaddleDType PaddleTensorGetDType<int64_t>() {
-  return PaddleDType::INT64;
-}
-
-template <>
-PaddleDType PaddleTensorGetDType<float>() {
-  return PaddleDType::FLOAT32;
-}
-
-template <typename T>
-PaddleTensor PaddleTensorCreate(
-    py::array_t<T> data, const std::string name = "",
-    const std::vector<std::vector<size_t>> &lod = {}, bool copy = false) {
-  PaddleTensor tensor;
-
-  if (copy) {
-    PaddleBuf buf(data.size() * sizeof(T));
-    std::copy_n(static_cast<T *>(data.mutable_data()), data.size(),
-                static_cast<T *>(buf.data()));
-    tensor.data = std::move(buf);
-  } else {
-    tensor.data = PaddleBuf(data.mutable_data(), data.size() * sizeof(T));
-  }
-
-  tensor.dtype = PaddleTensorGetDType<T>();
-  tensor.name = name;
-  tensor.lod = lod;
-  tensor.shape.resize(data.ndim());
-  std::copy_n(data.shape(), data.ndim(), tensor.shape.begin());
-
-  return tensor;
-}
-
-py::array PaddleTensorGetData(PaddleTensor &tensor) {  // NOLINT
-  py::dtype dt;
-  switch (tensor.dtype) {
-    case PaddleDType::INT32:
-      dt = py::dtype::of<int32_t>();
-      break;
-    case PaddleDType::INT64:
-      dt = py::dtype::of<int64_t>();
-      break;
-    case PaddleDType::FLOAT32:
-      dt = py::dtype::of<float>();
-      break;
-    default:
-      LOG(FATAL) << "unsupported dtype";
-  }
-  return py::array(dt, {tensor.shape}, tensor.data.data());
-}
 }  // namespace
 
 void BindInferenceApi(py::module *m) {
@@ -166,39 +89,23 @@ void BindPaddleBuf(py::module *m) {
         std::memcpy(buf.data(), static_cast<void *>(data.data()), buf.length());
         return buf;
       }))
-      .def(py::init(&PaddleBufCreate<int32_t>))
-      .def(py::init(&PaddleBufCreate<int64_t>))
-      .def(py::init(&PaddleBufCreate<float>))
+      .def(py::init([](std::vector<int64_t> &data) {
+        auto buf = PaddleBuf(data.size() * sizeof(int64_t));
+        std::memcpy(buf.data(), static_cast<void *>(data.data()), buf.length());
+        return buf;
+      }))
       .def("resize", &PaddleBuf::Resize)
       .def("reset",
            [](PaddleBuf &self, std::vector<float> &data) {
              self.Resize(data.size() * sizeof(float));
              std::memcpy(self.data(), data.data(), self.length());
            })
-      .def("reset", &PaddleBufReset<int32_t>)
-      .def("reset", &PaddleBufReset<int64_t>)
-      .def("reset", &PaddleBufReset<float>)
-      .def("empty", &PaddleBuf::empty)
-      .def("tolist",
-           [](PaddleBuf &self, const std::string &dtype) -> py::list {
-             py::list l;
-             if (dtype == "int32") {
-               auto *data = static_cast<int32_t *>(self.data());
-               auto size = self.length() / sizeof(int32_t);
-               l = py::cast(std::vector<int32_t>(data, data + size));
-             } else if (dtype == "int64") {
-               auto *data = static_cast<int64_t *>(self.data());
-               auto size = self.length() / sizeof(int64_t);
-               l = py::cast(std::vector<int64_t>(data, data + size));
-             } else if (dtype == "float32") {
-               auto *data = static_cast<float *>(self.data());
-               auto size = self.length() / sizeof(float);
-               l = py::cast(std::vector<float>(data, data + size));
-             } else {
-               LOG(FATAL) << "unsupported dtype";
-             }
-             return l;
+      .def("reset",
+           [](PaddleBuf &self, std::vector<int64_t> &data) {
+             self.Resize(data.size() * sizeof(int64_t));
+             std::memcpy(self.data(), data.data(), self.length());
            })
+      .def("empty", &PaddleBuf::empty)
       .def("float_data",
            [](PaddleBuf &self) -> std::vector<float> {
              auto *data = static_cast<float *>(self.data());
@@ -220,19 +127,6 @@ void BindPaddleBuf(py::module *m) {
 void BindPaddleTensor(py::module *m) {
   py::class_<PaddleTensor>(*m, "PaddleTensor")
       .def(py::init<>())
-      .def(py::init(&PaddleTensorCreate<int32_t>), py::arg("data"),
-           py::arg("name") = "",
-           py::arg("lod") = std::vector<std::vector<size_t>>(),
-           py::arg("copy") = false)
-      .def(py::init(&PaddleTensorCreate<int64_t>), py::arg("data"),
-           py::arg("name") = "",
-           py::arg("lod") = std::vector<std::vector<size_t>>(),
-           py::arg("copy") = false)
-      .def(py::init(&PaddleTensorCreate<float>), py::arg("data"),
-           py::arg("name") = "",
-           py::arg("lod") = std::vector<std::vector<size_t>>(),
-           py::arg("copy") = false)
-      .def("as_ndarray", &PaddleTensorGetData)
       .def_readwrite("name", &PaddleTensor::name)
       .def_readwrite("shape", &PaddleTensor::shape)
       .def_readwrite("data", &PaddleTensor::data)