Abstract: In order to shied the ultraviolet, sunshade on photonic band gap was proposed, the transmissivity of the ultraviolet radiation in 1-D and 2-D sunshade on photonic band gap was calculated by means of transfer matrix and the finite difference time domain method. The result shows that 1-D and 2-D sunshade on photonic band gap can be designed if appropriate parameter were selected. Incident angles have a greater impact on low limit of forbidden band.