Liquid lens has many advantages over the traditional glass lens , and its aberrations have always been the focus of research. In this paper, a liquid lens is proposed to further improve the imaging quality and reduce aberration. This liquid lens is composed of PDMA thin film, pure water, dimethyl silicone oil liquid and F2 glass. This lens designed and emulated by ZEMAX, which shows the geometrical aberration, spherical aberration and so on. The forces on the films of different shapes are analyzed by COMSOL so that to Select the appropriate film as the preferred material for liquid lens. The results indicate that the thin film in the middle is more suitable for making liquid lenses. The liquid lens compared with the traditional lens can reduce aberration and shows better image quality.