Method and system for switching access networks, mobile terminal and link management server

The invention discloses a method for switching access networks. The method for switching the access networks comprises the steps that communication is carried out between a mobile terminal and a service server through a link management server, interaction is carried out between the mobile terminal and the link management server when the mobile terminal needs to be switched to a second access network from a first access network under the situation that the mobile terminal carries out communication with the link management server through a first link in the first access network, so that the mobile terminal and the link management server are switched to a second link in the second access network to carry out communication from the first link. The invention further and correspondingly discloses a system for switching the access networks, the mobile terminal and the link management server. According to the method and system for switching the access networks, the mobile terminal and the link management server, the link management server can maintain link connection with the service server in the switching process of the access networks, service interruption can be avoided in the switching process of the access networks, and system stability can be improved.