A method for a wireless communication device to join a wireless transmission network, the wireless transmission network being a wireless transmission network group consisting of a base station and wireless relay stations subordinated to the base station; after said wireless communication device accesses to the wireless transmission network group through a source node, the method comprising the following steps of: (a) if said wireless communication device needs a handover (130, 220, 320, 450), completes the handover successfully by accessing to a target node and establishes a service connection (160, 240, 340, 470), proceeding to step (b), otherwise proceeding to step (c); characterized by: (b) a management node of the wireless transmission network group to which the target node accessed to by said wireless communication device belongs updating stored wireless network topology information of the wireless transmission network group, to complete the joining of said wireless communication device (170, 250, 350, 480), and the method ending; (c) the management node of the wireless transmission network group to which the source node accessed to by said wireless communication device belongs updating stored wireless network topology information of the wireless transmission network group, to complete the joining of said wireless communication device (180, 260, 360, 490); wherein said source node is a source base station or source wireless relay station; and said target node is a target base station or target wireless relay station; and the method further comprises: in step (b) and step (c), if said target node or source node is a wireless relay station, and the wireless relay station is an agent node which stores the wireless network topology information of a transmission sub-network subordinated to the wireless relay station, the agent node updating the wireless network topology information, and reporting update information of the access of said wireless communication device to said management node; and said management node updating said stored wireless network topology information according to the update information; if said target node or source node is a wireless relay station, and the wireless relay station is not an agent node, the wireless relay station reporting the update information of the access of said wireless communication device to said management node; and said management node updating said stored wireless network topology information according to the update information; if said target node or source node is a base station, and the base station is the management node, the base station updating said stored wireless network topology information according to the update information of the access of said wireless communication device; if said target node or source node is a base station, and the base station is not the management node, the base station reporting the update information of the access of said wireless communication device to said management node; and said management node updating said stored wireless network topology information according to the update information. (a) if said wireless communication device needs a handover (130, 220, 320, 450), completes the handover successfully by accessing to a target node and establishes a service connection (160, 240, 340, 470), proceeding to step (b), otherwise proceeding to step (c); characterized by: (b) a management node of the wireless transmission network group to which the target node accessed to by said wireless communication device belongs updating stored wireless network topology information of the wireless transmission network group, to complete the joining of said wireless communication device (170, 250, 350, 480), and the method ending; (c) the management node of the wireless transmission network group to which the source node accessed to by said wireless communication device belongs updating stored wireless network topology information of the wireless transmission network group, to complete the joining of said wireless communication device (180, 260, 360, 490);