Abstract: Based on the basic theory of lightwave diffraction, the regulation method of beam distortion in the diffraction process of the Kepler telescope system was studied by using a Gaussian-distributed laser beam. The aberration function method was constructed by using the intermediate-order Zernike polynomial to simulate the four-leaf distortion in the telescope system, and the Zernike factor was introduced into the optical system to compensate for the distortion effect. The results show that the wavelength and aperture have a significant influence on the distribution of singular light intensity, in which the increase of wavelength will change the shape of the light spot, the aperture will affect the intensity and size of the light spot, and the 11th order Zernike four-leaf deformation factor can offset the distortion phenomenon of the telescope system.