The experimental simulation technology for optical characteristic of space target is indispensable method to research optical characteristic of space target and space target recognition. It can provide a way about the realization of the observation process and simulation of observed data, which the geometric layout of equipment and mapping relationship are the key. Based on the overall layout of the optics laboratory and the design of the “3+1” axis, a laboratory reference coordinate system was established and the rotation angel of the detector and the threeaxis turntable was researched. While in the 180°~360° semicircle region the detector cannot reach, using the theory of space fold could realize the same effect with unfold space by adjusting the angle of turntable. Contrasting with the angle between the satellite body coordinate system with sun and detector in the STK, the mapping algorithm is provided to be correct.