The way to simulate the visible signal and infrared signal from satellite in space based on TracePro is intraduced. First, the satellite position's coordinate, satellite surface's coordinate and the earth's coordinate are converted to one unite coordinate, then the temperature model from Sinda/G is inserted in Tracepro, and the surface properties, such as the reflectivity and emissivity are built. The infrared characteristic of satellite radiation is obtained, using the gray radiation in the software. The distances between the satellite, the earth and the sun are determined by the above conversion. This simulation could directly show the optical action on the satellite surface, is propitious to analyze the process and improve the precision.