diff --git a/nc_http/tools/constant/__init__.py b/nc_http/tools/constant/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/nc_http/tools/constant/base.py b/nc_http/tools/constant/base.py
new file mode 100644
index 0000000..09bb011
--- /dev/null
+++ b/nc_http/tools/constant/base.py
@@ -0,0 +1,75 @@
+import re
+
+
+class ConstantDict:
+    """
+    常量字典基类
+    """
+
+    values = {}
+
+    @classmethod
+    def get_keys(cls):
+        return cls.values.keys()
+
+    @classmethod
+    def get_values(cls):
+        return cls.values.values()
+
+    @classmethod
+    def get_data(cls):
+        return cls.values
+
+    @classmethod
+    def present(cls):
+        return [{"id": key, "name": val} for key, val in cls.values.items()]
+
+    @classmethod
+    def get_value(cls, key):
+        return cls.values.get(int(key))
+
+    @classmethod
+    def validate(cls, key):
+        return int(key) in cls.values
+
+    @classmethod
+    def get_multi_dict(cls, keys):
+        return [{"id": key, "name": cls.get_value(key)} for key in keys if int(key) in cls.values.keys()]
+
+    @classmethod
+    def get_dict(cls, key):
+        return [{"id": key, "name": cls.get_value(key)} if int(key) in cls.values.keys() else {}][0]
+
+    @classmethod
+    def get_key_str(cls, val):
+        for key, value in cls.__dict__.items():
+            if re.match('^[A-Z_]+$', key):
+                if value == val:
+                    return key
+        return ''
+
+    @classmethod
+    def get_key_value_str(cls):
+        res = {}
+        for key, value in cls.__dict__.items():
+            if re.match('^[A-Z_]+$', key):
+                res[key] = value
+        return res
+
+    @classmethod
+    def get_id_by_name(cls, name):
+        for key, value in cls.values.items():
+            if value == name:
+                return key
+        return None
+
+    @classmethod
+    def get_key_choices(cls):
+        keys = cls.get_keys()
+        return ','.join(str(i) for i in keys)
+
+    @classmethod
+    def contains(cls, keyword):
+        keyword = keyword.strip()
+        result = [key for key, value in cls.values.items() if keyword in value]
+        return result