Abstract: Searching and locating a service is one of the major challenges in the unified identification service. A novel identification service network model based on P2P (peer to peer) network was proposed. The model consists of two separated P2P networks, that are service querying network (SQN) and identifier querying network (IQN). Both are formed by identification service providers. SQN is used to search the unified identifier of a service, which support user access by its unified identifier, according to service keywords. IQN is used to find the related information of a unified identifier, and a user can select and access the service with the found information. The procedure of unified identifier registering, publishing, and service publishing was described. The whole procedure that a client visits an application service by its unified identifier was given as well. The topology of a unified identification service network in this model is concise, and the network is good at scalability and robustness.