Abstract: The polarization state of input laser induced by the change of transmitted distance is studied.From theory analysis and experiment data,the polarization of input laser can be changed by wedge cholesteric liquid crystal cell through continual adjusting the transmitted distance.The input linearly polarized laser is changed to circularly polarized light.This change is not depent on the first polarize angle.The results show that wedge cholesteric liquid crystal cell can be used in the design and analysis of liquid crystal depolarizer.