A multiple LMA selection method in the mobile node switching process in the PWIPv6 domain is provided, wherein an N-MAG transmits the specific IBU message to the all LMAs in one PWIPv6 domain via respectively spreading the PBU message and the PBA message between the MAG and the LMA when the MN is switched from the p-MAG to the n-MAG, only the LMA preserving the MN previously bound information canupdate the MN bound information according to the content of the IBU message, and transmit the corresponding IBA message, other LMA can not echo, the n-MAG finally set up the binding relation for the identical LMA selected by the MN so as to ensure that the MN is all bound with the same LMA before and after the MN switching, thus solving the problem of the re-authentication of the AAA server, keeping the AAA information availability and service continuity, and optimizing the MN switching performance. The method can not spread the other protocol, has little change for the present message formatand the process flow of the PMIPv6, and can not depend on the other external structure added method, with simple, convenient and easy operation steps.