In order to achieve compund guidance functionssuch as autonomous guidancetarget positioning tracking and searchingetc.a design scheme of a small optical lens is proposedwhich can realize the integration of infrared and laser dual-spectrum and common aperture.The transmission optical system is adoptedand a wedge angle splitter is arranged in the optical pathwhich not only realizes dual-spectrum beam splittingbut also effectively corrects the system aberration caused by the 45° inclined flat plate.As a resultthe average Modulation Transfer Function (MTF) of the infrared channel is better than 0.45(30 lp/mm)and the diameter of diffusion spot in ±1.5° linear area of laser channel is 4.88~5.03 mmand the energy distribution is uniformwhich meets the requirements of the index.Finallythe high-precision optical centering adjustment and three-coordinate precise measurement are used to complete the assembly and adjustment of the lens.The average MTF of the full field of view of the infrared channel is better than 0.38the shape of the dispersion spot in the laser channel is symmetricalthe energy is evenly distributed in the linear regionand the lens effect is good.