In order to analyze the performance of UV communication in high atmosphere channel, the solar irradiation distribution model was built. Scattering coefficients and absorption coefficients of UV light with different wavelength were studied. Considering the noise caused by solar irradiation and the receiver, both path loss and SNR were simulated respectively in the condition of UV communication line-of-sight (LOS) link and non-line-of-sight (NLOS) link. The results show that the noise caused by solar irradiation is much less than that of the receiver below 30km in the air. At the wavelength of 280nm and height of 7km, it can realize communication at a range of 5km and rate of 10Mb/s by LOS link, and a range of 1km, rate of 50kb/s and elevations on the transceiver of 20° by NLOS link. A signal with the wavelength at either end of ‘solar-blind’ can decrease ozone absorption and increase SNR, which is suitable for both LOS and NLOS link. In addition, a signal with short wavelength can strengthen scattering, which is of benefit to realize NLOS communication.