Abstract: For the problem about the design of ultra wideangle photographic objective，an ultra wideangle photographic objective was designed with ZEMAX optical software. The design was carried out by limiting the basic parameters and dimensions of lens with various operations and by selecting the appropriate rear group. The former group structure was designed by using the three inverse Galileo systems. The former group and the rear group were mixed together and the overall initial structure was further optimizd. The optical system is composed of 16 pieces of spherical lenses applicable within the visible light region. The main optical parameters are as follows:the focal length is 6.2 mm，the full field of view(FOV) is 100，the F number is 2.1. From the result we can see that the absolute value of maximum distortion of FOV lens is less than 3.5%，the maximum field curve is less than 0.05 mm，the modulation transfer function (MTF) of the whole field of view at 50 lp/mm is greater than 0.7，approaching to the diffraction limit.