diff --git a/pymnn/src/MNN.cc b/pymnn/src/MNN.cc
index 71dc156b..849180e9 100644
--- a/pymnn/src/MNN.cc
+++ b/pymnn/src/MNN.cc
@@ -2054,8 +2054,6 @@ MOD_INIT(_mnncengine)
                 };
                 write(obj, dtype, total_length);
                 (*self)->unMap();
-                Py_XDECREF(obj);
-
             });
     // Load And Save
     expr_module.def("load_as_list",
@@ -2226,6 +2224,28 @@ MOD_INIT(_mnncengine)
                 }
                 PyObject *obj = value.ptr();
                 auto write = [](PyObject *obj, DType dtype, int64_t total_length) {
+ #ifndef USE_PRIVATE
+                    if(PyArray_Check(obj)) {
+                        //numpy support
+                        if(total_length != PyArray_Size(obj)) {
+                            throw std::runtime_error("data size does not match each other");
+                        }
+                        int npy_type = PyArray_TYPE(obj);
+                        int itemsize = getitemsize(dtype, npy_type);
+                        PyArrayObject *obj_cont= PyArray_GETCONTIGUOUS((PyArrayObject*)obj);
+                        auto tmpBuffer = PyArray_DATA(obj_cont);
+                        if(NULL == tmpBuffer) {
+                            throw std::runtime_error("numpy failed to get buffer");
+                        }
+                        auto data = malloc(total_length * itemsize);
+                        if (nullptr == data) {
+                            throw std::runtime_error("call to writeMap meet a error");
+                        }
+                        memcpy(data, tmpBuffer, total_length * itemsize);
+                        Py_XDECREF(obj_cont);
+                        return data;
+                    }
+#endif
                     INTS shapeData = getshape(obj);
                     int64_t totalLengthData = 1;
                     INTS stride;
@@ -2280,7 +2300,6 @@ MOD_INIT(_mnncengine)
                     ret = _Const((const void*)data, shape, data_format, dtype2htype(dtype));
                     free(data);
                 }
-                Py_XDECREF(obj);
                 return ret;
             },py::arg("value_list"), py::arg("shape"), py::arg("data_format")=NCHW, py::arg("dtype")=DType::DType_FLOAT);
     INTS default_stride = {1, 1};