1. A name-to-address mapping system in a locator and identifier separation network, the system comprising mapping nodes and access service nodes which are connected through a network, wherein, the access service node comprises a transceiver module, which is set to: receive messages sent by an endpoint and the mapping nodes; as well as send messages to the endpoint and the mapping nodes; the mapping node comprises: a transceiver module, which is set to: receive messages sent by the access service nodes or other mapping nodes than its own; as well as send messages to the access service nodes or other mapping nodes than its own; a first storing module, which is set to: store a node routing table which reflects corresponding relationships between identifiers and mapping nodes; a node determining module, which is connected to the transceiver module and the first storing module and is set to: inquire the node routing table to determine the mapping node corresponding to a destination identifier, when the determined mapping node is a mapping node other than its own, notify the transceiver module of the mapping node to forward the messages to the determined mapping node; when the determined mapping node is the current mapping node, notify an address inquiring module; a second storing module, which is set to: store a local mapping table, and the local mapping table storing mapping relationships between the local identifiers and routing identifiers; and the address inquiring module, which is connected to the second storing module and is set to: inquire the local mapping table according to the destination identifier to acquire a destination routing identifier; and notify the transceiver module of the mapping node to send messages to the access service node corresponding to the destination routing identifier.