The invention relates to a peer-to-peer network service primitive system belonging to the technical field of network communication and comprising an application service module, a peer-to-peer communication module, a transmission network module, a user interface module and an application interface module. The application service module is connected with the user interface module so as to transmit application service communication information; the user interface module is connected with the peer-to-peer communication module so as to transmit application service communication information; the peer-to-peer communication module is connected with the application interface module so as to transmit API information of application service; and the application interface module is connected with the transmission network module so as to transmit API information of application service. The invention can simplify the development and the deployment of a P2P application system, has flexible expansibility, and can be applied to the P2P system of a DHT protocol and a non-DHT protocol, thereby a plurality of P2P applications can be supported on the same coverage layer, the reusability of system resources is improved, the resource allocation efficiency can be optimized, the P2P network environment can be purified, and healthy P2P application can be provided.