LCOS (Liquid Crystal on Silicon) is well known as a device for projecting display (Refer to Fig. 1.) However, recently, the optical communication vendors have intended utilizing the LCOS as a WSS(Wavelength Selective Switching) because of robustness and small maintenance work (Refer to Fig. 2.) Still, the polarization dependency is one of the problems of LCOS. LCOS Master is modeling software that combines the LC molecular orientation and optical calculation, which promises customers to be able to obtain the optimal LCOS structure, physical properties, and driving scheme optimization as well.