diff --git a/paddle/scripts/paddle_build.sh b/paddle/scripts/paddle_build.sh
index 0b6b006bbb244188ac69c0218738fe3ef3bc9b49..42960c0cfb56fc27cb0b6924f2ed29150344bf89 100755
--- a/paddle/scripts/paddle_build.sh
+++ b/paddle/scripts/paddle_build.sh
@@ -562,6 +562,7 @@ function generate_upstream_develop_api_spec() {
 }
 
 function generate_api_spec() {
+    set -e
     spec_kind=$2
     if [ "$spec_kind" != "PR" ] && [ "$spec_kind" != "DEV" ]; then
         echo "Not supported $2"
@@ -572,7 +573,8 @@ function generate_api_spec() {
     cd ${PADDLE_ROOT}/build/.check_api_workspace
     virtualenv .${spec_kind}_env
     source .${spec_kind}_env/bin/activate
-    pip install ${PADDLE_ROOT}/build/python/dist/*whl
+    pip install -r ${PADDLE_ROOT}/python/requirements.txt
+    pip --no-cache-dir install ${PADDLE_ROOT}/build/python/dist/*whl
     spec_path=${PADDLE_ROOT}/paddle/fluid/API_${spec_kind}.spec
     python ${PADDLE_ROOT}/tools/print_signatures.py paddle > $spec_path
 
diff --git a/python/requirements.txt b/python/requirements.txt
index a78079650a982685b7c3d3fba97ed211d6d6d190..9473e604cc7d7df3fe4de847f9ef71cca1c76237 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,3 +1,4 @@
+opencv-python<=4.2.0.32
 requests>=2.20.0
 numpy>=1.12, <=1.16.4 ; python_version<"3.5"
 numpy>=1.12 ; python_version>="3.5"
diff --git a/tools/count_api_without_core_ops.py b/tools/count_api_without_core_ops.py
new file mode 100644
index 0000000000000000000000000000000000000000..99e84074158ad7ddbdb91148b53cc3433f03f3f8
--- /dev/null
+++ b/tools/count_api_without_core_ops.py
@@ -0,0 +1,187 @@
+# Copyright (c) 2020 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 importlib
+import inspect
+import collections
+import sys
+import pydoc
+import hashlib
+import six
+import functools
+
+__all__ = ['get_apis_with_and_without_core_ops', ]
+
+# APIs that should not be printed into API.spec 
+omitted_list = [
+    "paddle.fluid.LoDTensor.set",  # Do not know why it should be omitted
+    "paddle.fluid.io.ComposeNotAligned",
+    "paddle.fluid.io.ComposeNotAligned.__init__",
+]
+
+
+def md5(doc):
+    hash = hashlib.md5()
+    hash.update(str(doc).encode('utf-8'))
+    return hash.hexdigest()
+
+
+def split_with_and_without_core_ops(member, cur_name):
+    if cur_name in omitted_list:
+        return
+
+    if inspect.isclass(member):
+        pass
+    else:
+        try:
+            source = inspect.getsource(member)
+            if source.find('append_op') != -1:
+                if source.find('core.ops') != -1:
+                    api_with_ops.append(cur_name)
+                else:
+                    api_without_ops.append(cur_name)
+        except:
+            # If getsource failed (pybind API or function inherit from father class), just skip
+            pass
+
+
+def get_md5_of_func(member, cur_name):
+    if cur_name in omitted_list:
+        return
+
+    doc_md5 = md5(member.__doc__)
+
+    if inspect.isclass(member):
+        pass
+    else:
+        try:
+            source = inspect.getsource(member)
+            func_dict[cur_name] = md5(source)
+        except:
+            # If getsource failed (pybind API or function inherit from father class), just skip
+            pass
+
+
+def visit_member(parent_name, member, func):
+    cur_name = ".".join([parent_name, member.__name__])
+    if inspect.isclass(member):
+        func(member, cur_name)
+        for name, value in inspect.getmembers(member):
+            if hasattr(value, '__name__') and (not name.startswith("_") or
+                                               name == "__init__"):
+                visit_member(cur_name, value, func)
+    elif inspect.ismethoddescriptor(member):
+        return
+    elif callable(member):
+        func(member, cur_name)
+    elif inspect.isgetsetdescriptor(member):
+        return
+    else:
+        raise RuntimeError("Unsupported generate signature of member, type {0}".
+                           format(str(type(member))))
+
+
+def is_primitive(instance):
+    int_types = (int, long) if six.PY2 else (int, )
+    pritimitive_types = int_types + (float, str)
+    if isinstance(instance, pritimitive_types):
+        return True
+    elif isinstance(instance, (list, tuple, set)):
+        for obj in instance:
+            if not is_primitive(obj):
+                return False
+
+        return True
+    else:
+        return False
+
+
+def visit_all_module(mod, visited, func):
+    mod_name = mod.__name__
+    if mod_name != 'paddle' and not mod_name.startswith('paddle.'):
+        return
+
+    if mod_name.startswith('paddle.fluid.core'):
+        return
+
+    if mod in visited:
+        return
+
+    visited.add(mod)
+
+    for member_name in (
+            name
+            for name in (mod.__all__ if hasattr(mod, "__all__") else dir(mod))
+            if not name.startswith("_")):
+        instance = getattr(mod, member_name, None)
+        if instance is None:
+            continue
+
+        if is_primitive(instance):
+            continue
+
+        if not hasattr(instance, "__name__"):
+            continue
+
+        if inspect.ismodule(instance):
+            visit_all_module(instance, visited, func)
+        else:
+            visit_member(mod.__name__, instance, func)
+
+
+def get_apis_with_and_without_core_ops(modules):
+    global api_with_ops, api_without_ops
+    api_with_ops = []
+    api_without_ops = []
+    for m in modules:
+        visit_all_module(
+            importlib.import_module(m), set(), split_with_and_without_core_ops)
+    return api_with_ops, api_without_ops
+
+
+def get_api_source_desc(modules):
+    global func_dict
+    func_dict = collections.OrderedDict()
+    for m in modules:
+        visit_all_module(importlib.import_module(m), set(), get_md5_of_func)
+    return func_dict
+
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1:
+        modules = sys.argv[2].split(",")
+        if sys.argv[1] == '-c':
+            api_with_ops, api_without_ops = get_apis_with_and_without_core_ops(
+                modules)
+
+            print('api_with_ops:', len(api_with_ops))
+            print('\n'.join(api_with_ops))
+            print('\n==============\n')
+            print('api_without_ops:', len(api_without_ops))
+            print('\n'.join(api_without_ops))
+
+        if sys.argv[1] == '-p':
+            func_dict = get_api_source_desc(modules)
+            for name in func_dict:
+                print(name, func_dict[name])
+
+    else:
+        print("""Usage: 
+            1. Count and list all operator-raleated APIs that contains append_op but not core.ops.xx. 
+                python ./count_api_without_core_ops.py -c paddle
+            2. Print api and the md5 of source code of the api.
+                python ./count_api_without_core_ops.py -p paddle
+            """)