Aiming at the simulation requirement for multiple color temperatures of a star simulator,a simulation method of multiple color temperatures for a star simulator is put forward. Then,the influence of data and bandwidth data of different wave bands on color temperatures is analyzed with a combination of a broadband spectroscopic light source lamp array which is consisted of xenon lamps and halogen tungsten lamps. On the basis of polynomial fitting method,feedback control of color temperature simulation is realized by utilizing genetic algorithm. Therefore,spectrum simulation of 3900 K,4800 K and 6500 K color temperature within the spectral region between 350 nm and 900 nm is realized,which satisfies the simulation requirement for multiple color temperatures of a star simulator.