A route optimization method, characterized in that the method comprises: acquiring, by a Local Mobility Anchor LMA, any packet forwarded by the LMA, and acquiring, according to the any packet, a source IP address and a destination IP address of the any packet; determining, by the LMA according to the source IP address and the destination IP address, whether both parties in communication of the any packet access a local ProxyMobilelPv6 PMIPv6 domain; when both parties in communication of the any packet access the local PMIPv6 domain, acquiring, by the LMA according to the source IP address and the destination IP address, binding cache information of the two parties in communication, wherein the binding cache information comprises a binding cache entry; determining, by the LMA according to a number of the binding cache entry, whether multiple network interfaces of at least one of the two parties in communication access the local PMIPv6 domain; when multiple network interfaces of at least one of the two parties in communication access the local PMIPv6 domain, determining, by the LMA, whether the two parties in communication each have a network interface accessing a same mobile access gateway MAG; when the two parties in communication each have a network interface accessing a same MAG, determining whether all network interfaces transmitting original data of the two parties in communication access the same MAG; when not all network interfaces transmitting original data of the two parties in communication access the same MAG, determining, by the LMA, whether an original data MAG of any of the two parties in communication is connected to any network interface of the other party communicating with the any of the two parties in communication, wherein the original data MAG is a MAG accessed by a network interface transmitting original data; if not, sending, by the LMA, a route optimization indication to the original data MAG and/or a target MAG, wherein the route optimization indication indicates the original data MAG and/or the target MAG to perform route optimization on a packet transmission path, and the target MAG is the MAG accessed by both parties in communication; if so, sending, by the LMA, the shared MAG a route optimization indication indicating the shared MAG to perform route optimization on the packet transmission path, wherein the shared MAG is, of respective original data MAGs of the parties in communication, the MAG connected to both parties in communication. acquiring, by a Local Mobility Anchor LMA, any packet forwarded by the LMA, and acquiring, according to the any packet, a source IP address and a destination IP address of the any packet; determining, by the LMA according to the source IP address and the destination IP address, whether both parties in communication of the any packet access a local ProxyMobilelPv6 PMIPv6 domain; when both parties in communication of the any packet access the local PMIPv6 domain, acquiring, by the LMA according to the source IP address and the destination IP address, binding cache information of the two parties in communication, wherein the binding cache information comprises a binding cache entry; determining, by the LMA according to a number of the binding cache entry, whether multiple network interfaces of at least one of the two parties in communication access the local PMIPv6 domain; when multiple network interfaces of at least one of the two parties in communication access the local PMIPv6 domain, determining, by the LMA, whether the two parties in communication each have a network interface accessing a same mobile access gateway MAG; when the two parties in communication each have a network interface accessing a same MAG, determining whether all network interfaces transmitting original data of the two parties in communication access the same MAG; when not all network interfaces transmitting original data of the two parties in communication access the same MAG, determining, by the LMA, whether an original data MAG of any of the two parties in communication is connected to any network interface of the other party communicating with the any of the two parties in communication, wherein the original data MAG is a MAG accessed by a network interface transmitting original data; if not, sending, by the LMA, a route optimization indication to the original data MAG and/or a target MAG, wherein the route optimization indication indicates the original data MAG and/or the target MAG to perform route optimization on a packet transmission path, and the target MAG is the MAG accessed by both parties in communication; if so, sending, by the LMA, the shared MAG a route optimization indication indicating the shared MAG to perform route optimization on the packet transmission path, wherein the shared MAG is, of respective original data MAGs of the parties in communication, the MAG connected to both parties in communication.