Aiming at the feature of equivalent flight control, put forwards a project of equivalent flight control based on multithread technology and user datagram protocol (UDP) protocol in a LAN. Make use of multithread technology and the broadcast multipoint communication of UDP protocol, the thesis stresses on the overall design of the project, analyzes the key point in the design of multithread control module, including the multithread create, communication and synchronize and so on. The result shows that method can satisfactorily realizes the development of equivalent flight control, and solve the problem of multitask attemper and the communication for equivalent flight control.