Ad Hoc network technology can significantly extend the effective range of ultraviolet scattering communication.So it is important to discuss the coverage of communication nodes.Based on solar-blind ultraviolet (200-280 nm) communication features and the inherent characteristics of Ad Hoc network,three types of UV non-line-of-sight (NLOS) communication system are analyzed.Atmosphere transmission attenuation,effective scattering volume and received power in single scattering channel are discussed.The node communication distance is calculated and the coverage model of a UV communication network node is established according to the different focal angles of transmitter and receiver.At last,the formulas and calculation method of the coverage area are given.