Combining the aspherical lens principle, a fixed-focus lens with compact structure and low cost is designed with the optical system design software CODE V to meet the requirement of the mobile communication on miniaturization and simplification of camera lenses. For the designed lens, the F number is 2.05, the angle of vision is 62°, the half image height is 2.4 mm, and the total length of the system is 5.59 mm. The aspherical lens made of plastic is used to reduce the size and save production cost in the structural design. The design result shows that the pixel size of the lens is 1.1 μm×1.1 μm, the corresponding Nyquist frequency is 454 lp/mm, the modulation transfer function (MTF) values of most FOV at half Nyquist frequency are more than 0.4, transverse aberration of all FOV is less than 9.26 μm, the root-mean-square (RMS) radii are less than Airy disk, and the distortion is less than 1%. The designed lens has an excellent imaging performance.