Abstract: The solar simulator as a crucial equipment is used in simulating the space environment for satellites, testing and calibrating for solar cells. The air mass filter as the crucial component can filtrate the lamp for getting the proper solar spectrum. Through the air mass0(AM0) filter the solar spectrum on the surface of aerosphere could be obtained. The transmittance of AM0 filter could be obtained through the standard AM0 spectrum and xenon lamp spectrum. Then, the design and fabrication of the filter was done. The filter gets the A level standard. At last, the filter was dealt with ultraviolet and high temperature for studying the optical stability. The results show the new filter is better than the traditional filter in optical stability.