The invention provides a service processing method by multiflow mapping technique, for processing service request of source user to object user, comprising: according to service request of source user, issuing multiflow mapping information of the service to the routers corresponding to the source and object users by resources management server, respectively; and the routers complete flow mapping installation according to the multiflow mapping information, open and execute policy switches and make message classification, QoS action and bandwidth preservation for flows; and the routers make united management and computation on multiple flows of the service.