The affects of various aberration on geometrical center position, and the deviation of displayed star position energy center caused by aberration in the star simulator optical system were analyzed and comprehensively evaluated. The analysis results show that, the energy generated by the greater star position field will be more uneven, and the energy center offset will be more obvious. Coma and distortion have great influence on the energy star center. According to the property of coaxial optical system composed by the spherical mirror, energy center offset is occurred in the polar radius direction of the star. A correction method based on polar coordinates of the star position was proposed, which only need to correct the polar radius in the direction of star. The method simplifies the correction based on twodimensional coordinate axes partition and reduces a lot of data calculations. The errors between the revised single star positions with star simulator corrected and uncorrected were tested by the polar coordinate correction method, the experimental results show that the correction processing based on polar coordinates is simple and shortcut, and the correction results are more accurate.