The Zemax optical simulation program was used to design a multilens configuration and further optimize the design of a lens module using six plastic lenses and 12 aspheric surfaces. The lens module with 13 million pixels was designed for application in a cellphone camera module. The basic specifications of the design with six plastic lenses were established and matched with those of an OV13853 complementary metal oxide semiconductor (CMOS) chip, and the minimum imaging circle radius of the designed optical lens module based on OV13853 was 3.029 mm. The optimized mirror aspheric coefficients of surfaces #1–#12 of the designed lens module and the aspheric coefficients of each mirror surface were increased to the 18th order. The optimal parameters for the designed lens module, including the radiuses, thicknesses, conics, and materials used, are presented in this paper. The modulation transfer function (MTF) curves, the ranges of field curvature, the maximum horizontal chromatic aberration, and the maximum range of Seidel aberration were also found.