A method for realizing network switching, applied in a case that a Mobile Node, MN, is switched from a first Mobile Access Gateway to a second Mobile Access Gateway to access a Local Mobility Anchor, wherein the Mobile Node is connected with the first Mobile Access Gateway through a first interface, and connected with the second Mobile Access Gateway through a second interface, characterized in that after receiving an IP address from the MN, a target network of the switching judges the access of the MN as a switching access and allocates the IP address to the MN; wherein the target network of the switching comprises the second Mobile Access Gateway and the Local Mobility Anchor; wherein if the Local Mobility Anchor judges the access of the MN as a switching access, the method also comprises: the Local Mobility Anchor receiving a Proxy Binding Update message from the second Mobile Access Gateway, wherein the Proxy Binding Update message carries identifier information of the Mobile Node, an IP address of the first interface, and an IP address of the second Mobile Access Gateway; the Local Mobility Anchor checking whether the identifier information of the Mobile Node and the IP address of the first interface exist in a Binding Cache Entry stored therein; in the case that the identifier information of the Mobile Node and the IP address of the first interface are found, the Local Mobility Anchor further judging whether a Proxy Care-of-Address in the Binding Cache Entry is the same as the Proxy Care-of-Address in the Proxy Binding Update message; if the judging result is that the Proxy Care-of-Address in the Binding Cache Entry is different from the Proxy Care-of-Address in the Proxy Binding Update message, the Local Mobility Anchor judging that the connection of the Mobile Node is a switching connection, and if it is judged that the Mobile Node has an ability of address preservation, sending a Proxy Binding Acknowledgement message, which carries the IP address of the first interface, to the second Mobile Access Gateway. the Local Mobility Anchor receiving a Proxy Binding Update message from the second Mobile Access Gateway, wherein the Proxy Binding Update message carries identifier information of the Mobile Node, an IP address of the first interface, and an IP address of the second Mobile Access Gateway; the Local Mobility Anchor checking whether the identifier information of the Mobile Node and the IP address of the first interface exist in a Binding Cache Entry stored therein; in the case that the identifier information of the Mobile Node and the IP address of the first interface are found, the Local Mobility Anchor further judging whether a Proxy Care-of-Address in the Binding Cache Entry is the same as the Proxy Care-of-Address in the Proxy Binding Update message; if the judging result is that the Proxy Care-of-Address in the Binding Cache Entry is different from the Proxy Care-of-Address in the Proxy Binding Update message, the Local Mobility Anchor judging that the connection of the Mobile Node is a switching connection, and if it is judged that the Mobile Node has an ability of address preservation, sending a Proxy Binding Acknowledgement message, which carries the IP address of the first interface, to the second Mobile Access Gateway.