Method for implementing WAPI system terminal zero interference charging

A method for realizing zero intervention charging of a WAPI system terminal can be applied in a wireless local area network which uses WAPI as an identification and confidentiality system. The invention sends upline requirements of users to AC through AP, the AC utilizes the identity words of users in the upline requirements to complete the RADIUS identification process. The charging for users can be realized by the way that the AP sends messages of upline and downline. The invention ensures that the AC does not need monitoring the state of users for charging in real time and does not need amending the process of the WAPI agreement, and has the advantages of zero user intervention, simple terminal interface, simplified charging process and high security.