This invention relates to a switch method among isomeric networks by terminals including: a service access point receives an initialized request of switch, it requires resource distribution information to an adjacent target access point and selects multiple available target access points and their corresponding access networks to send them to the terminal for switching, in which, a terminal can select multiple target access points and their corresponding access networks, and when the terminal is ready for switch, it can set up links with the target access points and the corresponding networksso as to increase probability of successful switch.