Abstract: Based on the conventional spherical glass lens and the aspherical lens principle, a low cost and fixed-focus lens system is designed with the optical system design software CODE V to meet the requirement of the mobile communication on miniaturization and simplification camera lenses. The total length of the lens system is less than 5mm and it has excellent imaging performance. An aspherical lens made of polyolefin-plastic is used to reduce the size and save production cost. The pixel size of the lens is 2.52μm×2.52μm, the corresponding Nyquist frequency is 196 lines/mm, the relative resolution performance (modulation transfer function) of the design can reach 40% at half of Nyquist frequency, the spherical aberration of this lens is between -0.05mm and 0.05mm, and the maximal distortion is less than 0.17%. The compact, low-cost, high-precision and miniature lens can meet the requirement of the two-mega pixels.