The invention provides a system for issuing a gray level. The system comprises a Redis server and an Nginx server, wherein the Nginx server is used for checking if a shunt strategy identity exists in Cache; if the shunt strategy identity does not exist, the Nginx server is capable of reading a present shunt strategy identity from a preset position in the Redis server and checking if a strategy analysis file and a user information analysis file corresponding to the present shunt strategy identity exist in a memory according to the present shunt strategy identity; and if the strategy analysis file and the user information analysis file do not exist, the Nginx server is capable of loading the strategy analysis file and the user information analysis file existing in a form of character string in the Redis server into the memory through lua in the manner of loading the character string according to the present shunt strategy identity and then issuing according to the shunt strategy analyzed by the strategy analysis file. In the process, when a new shunt strategy is added, the reload or the restarting of the Nginx server is not required. Besides, the invention also provides a method for issuing the gray level.