Abstract: In order to meet the demands of multi magnitude, high magnitude in calibration on the ground for deep space navigation sensor, a new simulation method using of the OLED and optical fiber coupling mechanism combining with high precision target to simulate the stars innovatively, was given based on optical fiber coupling technique. The light coupling technology using surface light source and fiber and the double modulation technology of OLED were researched deeply after analyzing of designed star charts simulator parameters. To achieve high coupling efficiency, analyzing the key condition of coupling, the coupling mechanism was decided to select the big core diameter POF(NA=0.6) and the self focusing lens. Design result shows that gathering spot diameter100 m, light energy utilization rate of fiber core 80%.The design results of magnitude simulation by the double modulation technology of surface light source shows that the technical problem of accurately simulation of 5-10 magnitude can be solved, but this can not realize only using the single electrical gray modulation or spatial gray scale modulation.