The invention provides a network switching method. The method comprises the following steps: upon receiving the link quality-deteriorating indication information sent by an MN, sending a query messageof a candidate switching network to the MN; after receiving a response message carrying the candidate network list sent by the MN, determining a target service point TPOS from the candidate network list, and sending a network switching submitting request carrying the TPOS information to the MN; upon receiving the response message of the MN about the TPOS information, sending an extended signalingto the TPOS; upon receiving a response message corresponding to the extended signaling replied by the TPOS, notifying the MN to be switched to the TPOS. The method is used for signalling extension inthe current service point SPOS and TPOS interaction process, so that the extended signaling integrates the signaling content of MIH messages and the FPMIPv6 protocol. As a result, the fusion of a network layer and an MIH layer is achieved. The number of redundant signaling messages is reduced. Meanwhile, the interaction process of mobile equipment is improved, so that the participation degree ofthe mobile equipment in the switching process is reduced. Therefore, the time delay and the signaling overhead of network switching are reduced.