Abstract: The high irradiance solar simulator is a key equipment in solar high temperature experimental research. The traditional solar simulator light source array adopts the fixed circular arrangement structure,and can only output the flat spot along the focal axis direction. In this study,a flexible high-irradiance solar simulator was designed by using glass optical fiber as the medium for transmitting radiation,and the radiation performance of the solar simulator was verified through the flux mapping method. Experimental results show that the simulator can realizes different irradiance distributions in two-dimensional and three-dimensional spaces by changing the arrangement of optical fiber bundles.