Abstract: In order to study the effect of the surface temperature of reflector under the laser irradiation during laser propulsion,a self-designed temperature measurement system was adopted to measure the surface temperature of the rotating parabolic aluminum target under the irradiation of different laser power,the temperature vs.time curves in different conditions was obtained.The results show that the laser absorptivity increases with the incidence angle; the surface temperature depends on the radial distance from irradiating position according to the Gaussian distribution function.The inadiation position has different rising and lowering temperature features compared with other positions.The temperatures on the surface tend to be the same and follow the same thermal diffusion and temperature lowing curve since several seconds after switching off the laser irradiation.