Abstract: The size and shape of the output light spot in the traditional solar simulators is difficult to be adjusted due to its relatively fixed structure. This paper used flexible fiber bundles to transmit high-intensity optical flow in the solar simulator,and measured the output energy flow density distribution of the simulator by CCD（ charge-coupled device）camera and other devices under different spatial arrangements. The results show that specific spot shapes and energy flow density can be obtained by adjusting the spatial arrangements of optical fiber bundles and the power of xenon lamp,thus realizing the flexible adjustments of output spots in 3 D space.