diff --git a/nc_http/tools/helpers/file.py b/nc_http/tools/helpers/file.py
new file mode 100644
index 0000000..202215e
--- /dev/null
+++ b/nc_http/tools/helpers/file.py
@@ -0,0 +1,15 @@
+import os
+import time
+
+
+def save_file(f, clip=None, root=None):
+    clip = clip or ''
+    clip_path = os.path.join(root, clip, str(int(time.time())))
+    if not os.path.exists(clip_path):
+        os.makedirs(clip_path)
+
+    file_path = os.path.join(clip_path, f.filename)
+    with open(file_path, 'wb+') as tmp_f:
+        tmp_f.write(f.read())
+
+    return file_path
diff --git a/nc_http/tools/helpers/params.py b/nc_http/tools/helpers/params.py
new file mode 100644
index 0000000..5a9c9e4
--- /dev/null
+++ b/nc_http/tools/helpers/params.py
@@ -0,0 +1,23 @@
+def filter_fields(data, valid_fields):
+    """
+    过滤字段
+    :param data:
+    :param valid_fields: 格式['field1', 'field2', 'field3', {'field4': ['sub_field1', 'sub_field2']}]
+    :return:
+    """
+    if isinstance(data, list):
+        tmp = []
+        for item in data:
+            tmp.append(filter_fields(item, valid_fields))
+        format_data = tmp
+    else:
+        format_data = {}
+        for field in valid_fields:
+            if isinstance(field, dict):
+                for key, sub_valid_fields in field.items():
+                    if isinstance(sub_valid_fields, list) and key in data:
+                        format_data[key] = filter_fields(data[key], sub_valid_fields)
+            else:
+                if field in data:
+                    format_data[field] = data[field]
+    return format_data