This disclosure relates to a method, system and device for optimizing routing in a mobile IPv6. The core is that the communication between a mobile node and a correspondence node is performed in a routing optimization mode, while providing a secure verification, so that the care-of address of the mobile node would not be obtained by a distrustful third party or a distrustful correspondence node. Moreover, to further ensure the privacy of the location of the mobile node, the current care-of address of the mobile node is shielded from the correspondence node by separating the binding cache from the correspondence node.