The invention discloses a method of constructing terminal topology, which is used in a network access side. The network includes an access server, a plurality of terminal users and at least an access switch connected with the access server and the terminal users and providing the terminal users with authentication transmission service and includes the following steps: the access server obtains address information and status information of the terminal users; the access server draws the terminal topology containing the access switch, according to the information and the stored address information of the access switch, in order to reveal to a network administrator. By the inventive embodiment, the access server can monitor the terminal users' status by the terminal topology, quickly locate the terminal users, the access switch or the equipment with problems by terminal link analysis and provides with comprehensive management as for the terminal users.