The invention relates to an annular escape system adopting authentication servers. The annular escape system is characterized by comprising a server group S={S1, S2...SN}, the server group S comprises N (N is larger than or equal to 3) authentication servers S1, S2...SN which are connected with one another; each authentication server Si in the server group S has a main backup server Sj and an auxiliary backup server Sk in the server group S; besides, each authentication server Si is the main backup server of a certain authentication server Sp and an auxiliary backup server of a certain authentication server Sq in the server group S; besides, main backup relations and auxiliary backup relations of all the authentication servers in the server group S form a loop. The invention further provides an annular escape method adopting the authentication servers. With the adoption of the annular escape system and method adopting authentication servers, business application can be recovered quickly and effectively, the disaster attack resistance can be improved, and the number of backup authentication servers is reduced.