Based on the SAO catalogue, it is presented an approach for modeling and simulating on star map genetation for all-sky. All this can be done with the SAO catalogue in the following way. First, with time conversion, the star position eliminated the effect of the proper motion. Next, throught conversion of precession, nutation and aberration, it gived the star position of the observation named time. Finally, it transformed position coordinates and grayness of star sensor’s parameters in any time and at any places.