The Liou-Brennan (L-B) eye model is constructed using the optical design software ZEMAX. The material of Intraocular Lens (IOL) is hydrophobic acrylate. A multifocal intraocular lens with a diffractive surface on the anterior surface and an aspherical surface on the anterior surface is designed. The design uses 0th order and +1 order of diffraction. When the object is in different positions, different diffraction orders play a role. For the designed IOL, the additional optical power is 1.66 D, the optical powers of the two focal points are correspond to 20 D and 21.66 D respectively. The establishment of small additional power aims to focus on optimizing the optical quality of the intraocular lens at the mid-distance. Firstly, the diffraction efficiency of the diffractive surface is calculated based on the theory of diffractive optics. The optical parameters of the diffractive surface and the aspherical surface is obtained by ZEMAX optical design software. Then the phase structure and the actual surface profile of the diffractive surface are simulated by MATLAB simulation software. Finally, The designed IOL is processed by a single point diamond lathe. According to the measured optical Modulation Transfer Function (MTF) The optical quality of the designed IOL is analyzed and the correctness of the additional optical power is verified by the measured defocus curve. The design meets the optical modulation transfer function (MTF) at 50 lp/mm greater than 0.3, which provides better visual clarity for cataract patients for different distances. The new type of intraocular lens uses in the working distance of 75.3 cm, providing theoretical and experimental basis for the application of small additional power intraocular lens.