diff --git a/imperative/python/src/ops.cpp b/imperative/python/src/ops.cpp
index 392092edc3ef351c9fc95884eb8ff95bba5414e6..1be1253d0e8be7cd95a2d3d29f2f2d13496c1d39 100644
--- a/imperative/python/src/ops.cpp
+++ b/imperative/python/src/ops.cpp
@@ -170,7 +170,7 @@ struct EnumTrait;
     PyObject_HEAD \
     T value; \
     constexpr static const char *name = EnumTrait<T>::name; \
-    static PyTypeObject type; \
+    static PyTypeObject* type; \
     static const char* members[]; \
     static std::unordered_map<std::string, T> mem2value; \
     static PyObject* pyobj_insts[];
@@ -196,7 +196,7 @@ struct EnumWrapper {
     }
     static bool load(py::handle src, T& value) {
         PyObject* obj = src.ptr();
-        if (PyObject_TypeCheck(obj, &type)) {
+        if (PyObject_TypeCheck(obj, type)) {
             value = reinterpret_cast<EnumWrapper*>(obj)->value;
             return true;
         }
@@ -224,7 +224,6 @@ struct EnumWrapper {
 template<typename T>
 struct BitCombinedEnumWrapper {
     PyEnumHead
-    static PyNumberMethods number_methods;
     std::string to_string() const {
         uint32_t value_int = static_cast<uint32_t>(value);
         if (value_int == 0) {
@@ -302,7 +301,7 @@ struct BitCombinedEnumWrapper {
     }
     static bool load(py::handle src, T& value) {
         PyObject* obj = src.ptr();
-        if (PyObject_TypeCheck(obj, &type)) {
+        if (PyObject_TypeCheck(obj, type)) {
             value = reinterpret_cast<BitCombinedEnumWrapper*>(obj)->value;
             return true;
         }
@@ -330,8 +329,7 @@ struct BitCombinedEnumWrapper {
         auto v = static_cast<std::underlying_type_t<T>>(value);
         mgb_assert(v <= EnumTrait<T>::max);
         if ((!v) || (v & (v - 1))) {
-            PyTypeObject* pytype = &type;
-            PyObject* obj = pytype->tp_alloc(pytype, 0);
+            PyObject* obj = type->tp_alloc(type, 0);
             reinterpret_cast<BitCombinedEnumWrapper*>(obj)->value = value;
             return obj;
         } else {
diff --git a/imperative/python/test/unit/core/test_imperative_rt.py b/imperative/python/test/unit/core/test_imperative_rt.py
index 4934eecf100966a4c0cd477f8e9dba6c86d4f14c..04b08307f0b0c4fdf5b5d0a7946a4076a4fbf60b 100644
--- a/imperative/python/test/unit/core/test_imperative_rt.py
+++ b/imperative/python/test/unit/core/test_imperative_rt.py
@@ -69,3 +69,16 @@ def test_raw_tensor():
     np.testing.assert_allclose(x * x, yy.numpy())
     (yy,) = apply(Elemwise(Elemwise.Mode.MUL), xx, xx)
     np.testing.assert_allclose(x * x, yy.numpy())
+
+
+def test_opdef_path():
+    from megengine.core.ops.builtin import Elemwise
+
+    assert Elemwise.__module__ == "megengine.core._imperative_rt.ops"
+    assert Elemwise.__name__ == "Elemwise"
+    assert Elemwise.__qualname__ == "Elemwise"
+
+    Mode = Elemwise.Mode
+    assert Mode.__module__ == "megengine.core._imperative_rt.ops"
+    assert Mode.__name__ == "Mode"
+    assert Mode.__qualname__ == "Elemwise.Mode"
diff --git a/imperative/tablegen/targets/python_c_extension.cpp b/imperative/tablegen/targets/python_c_extension.cpp
index a51f2ceb301376cdf7321da75054a9d8a506328c..c17506e13f626b690c71a7603aa5d9d5314434b5 100644
--- a/imperative/tablegen/targets/python_c_extension.cpp
+++ b/imperative/tablegen/targets/python_c_extension.cpp
@@ -97,7 +97,7 @@ void EnumAttrEmitter::emit_tpl_spl() {
     if (!firstOccur) return;
 
     os << tgfmt(
-            "template<> PyTypeObject $enumTpl<$opClass::$enumClass>::type = {};\n",
+            "template<> PyTypeObject* $enumTpl<$opClass::$enumClass>::type = nullptr;\n",
             &ctx);
 
     auto quote = [&](auto&& i) -> std::string {
@@ -120,13 +120,6 @@ $enumTpl<$opClass::$enumClass>::mem2value = {$0};
             "template<> PyObject* "
             "$enumTpl<$opClass::$enumClass>::pyobj_insts[$0] = {nullptr};\n",
             &ctx, attr->getEnumMembers().size());
-
-    if (attr->getEnumCombinedFlag()) {
-        os << tgfmt(
-                "template<> PyNumberMethods "
-                "$enumTpl<$opClass::$enumClass>::number_methods = {};\n",
-                &ctx);
-    }
 }
 
 Initproc EnumAttrEmitter::emit_initproc() {
@@ -140,45 +133,70 @@ void $0(PyTypeObject& py_type) {
 
     if (firstOccur) {
         os << tgfmt(R"(
-    e_type = {PyVarObject_HEAD_INIT(NULL, 0)};
-    e_type.tp_name = "megengine.core._imperative_rt.ops.$opClass.$enumClass";
-    e_type.tp_basicsize = sizeof($enumTpl<$opClass::$enumClass>);
-    e_type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;
-    e_type.tp_doc = "$opClass.$enumClass";
-    e_type.tp_base = &PyBaseObject_Type;
-    e_type.tp_repr = $enumTpl<$opClass::$enumClass>::py_repr;
-    e_type.tp_richcompare = $enumTpl<$opClass::$enumClass>::tp_richcompare;
+    static PyType_Slot slots[] = {
+        {Py_tp_repr, (void*)$enumTpl<$opClass::$enumClass>::py_repr},
+        {Py_tp_richcompare, (void*)$enumTpl<$opClass::$enumClass>::tp_richcompare},
 )", &ctx);
         if (attr->getEnumCombinedFlag()) {
             // only bit combined enum could new instance because bitwise operation,
             // others should always use singleton
             os << tgfmt(R"(
-    e_type.tp_new = $enumTpl<$opClass::$enumClass>::py_new_combined_enum;
-    auto& number_method = $enumTpl<$opClass::$enumClass>::number_methods;
-    number_method.nb_or = $enumTpl<$opClass::$enumClass>::py_or;
-    number_method.nb_and = $enumTpl<$opClass::$enumClass>::py_and;
-    e_type.tp_as_number = &number_method;
+        {Py_tp_new, (void*)$enumTpl<$opClass::$enumClass>::py_new_combined_enum},
+        {Py_nb_or, (void*)$enumTpl<$opClass::$enumClass>::py_or},
+        {Py_nb_and, (void*)$enumTpl<$opClass::$enumClass>::py_and},
 )", &ctx);
         }
+        os << R"(
+        {0, NULL}
+    };)";
+
+os << tgfmt(R"(
+    static PyType_Spec spec = {
+        // name
+        "megengine.core._imperative_rt.ops.$opClass.$enumClass",
+        // basicsize
+        sizeof($enumTpl<$opClass::$enumClass>),
+        // itemsize
+        0,
+        // flags
+        Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE,
+        // slots
+        slots
+    };)", &ctx);
+
+        os << tgfmt(R"(
+    e_type = reinterpret_cast<PyTypeObject*>(PyType_FromSpec(&spec));
+)", &ctx);
 
-        os << "    mgb_assert(PyType_Ready(&e_type) >= 0);\n";
+        for (auto&& i : {
+                std::pair<std::string, std::string>{"__name__", tgfmt("$enumClass", &ctx)},
+                {"__module__", "megengine.core._imperative_rt.ops"},
+                {"__qualname__", tgfmt("$opClass.$enumClass", &ctx)}}) {
+        os << formatv(R"(
+    mgb_assert(
+            e_type->tp_setattro(
+                    reinterpret_cast<PyObject*>(e_type),
+                    py::cast("{0}").release().ptr(),
+                    py::cast("{1}").release().ptr()) >= 0);
+)", i.first, i.second);
+        }
 
 
         auto&& members = attr->getEnumMembers();
         for (size_t idx = 0; idx < members.size(); ++ idx) {
             os << tgfmt(R"({
-    PyObject* inst = e_type.tp_alloc(&e_type, 0);
+    PyObject* inst = e_type->tp_alloc(e_type, 0);
     reinterpret_cast<$enumTpl<$opClass::$enumClass>*>(inst)->value = $opClass::$enumClass::$0;
-    mgb_assert(PyDict_SetItemString(e_type.tp_dict, "$0", inst) >= 0);
+    mgb_assert(PyDict_SetItemString(e_type->tp_dict, "$0", inst) >= 0);
     $enumTpl<$opClass::$enumClass>::pyobj_insts[$1] = inst;
 })", &ctx, members[idx], idx);
         }
-        os << "    PyType_Modified(&e_type);\n";
     }
 
     os << tgfmt(R"(
+    Py_INCREF(e_type);
     mgb_assert(PyDict_SetItemString(
-        py_type.tp_dict, "$enumClass", reinterpret_cast<PyObject*>(&e_type)) >= 0);
+        py_type.tp_dict, "$enumClass", reinterpret_cast<PyObject*>(e_type)) >= 0);
 )", &ctx);
     os << "}\n";
     return initproc;
diff --git a/imperative/test/CMakeLists.txt b/imperative/test/CMakeLists.txt
index 68d0dcecb748ea7f2ed9cd85c8cf7c4447a74c23..3ecd7936336772891adbe23d2151dc8df5960a3f 100644
--- a/imperative/test/CMakeLists.txt
+++ b/imperative/test/CMakeLists.txt
@@ -11,6 +11,7 @@ endif()
 
 # TODO: turn python binding into a static/object library
 add_executable(imperative_test ${SOURCES} ${SRCS})
+add_dependencies(imperative_test mgb_opdef)
 target_include_directories(imperative_test PRIVATE ${MGB_TEST_DIR}/include ../src/include ${MGB_OPDEF_OUT_DIR})
 
 # Python binding