A method for controlling the traffic of an authentication server and an authentication access apparatus, wherein a local area network token bucket including a high priority token bucket and a low priority token bucket is set according to the capability of the authentication server in processing the request message, and the request message sent by the authentication client is redirected to the authentication server after allocating a token to the authentication client, thus the traffic of the authentication server is controlled, so that the authentication server will not receive more request messages than it can handle. Meanwhile, the tokens in the high priority token bucket are reserved specially for authentication clients of a high priority, and they cannot be used by authentication clients that are not of a high priority, so the quality of service for authentication clients of a high priority is improved.