After the laser beam with a center wavelength of 1064nm passes through the collimated beam expander optical system, its light intensity still presents a Gauss-like distribution. In order to carry out the research on shaping and homogenization, a gradient attenuator was designed according to the aperture method and the laser light intensity distribution curve. The structure of the attenuation sheet is composed of a plurality of light-shielding rings and light-transmitting rings, which physically shield the laser beam to achieve the purpose of reducing the inhomogeneity of the laser energy. MATLAB is used to calculate the radius of each light-shielding ring zone, and Zemax is used to simulate the incoherent irradiance results of the attenuator when it acts on the laser. The simulation results show that the attenuator can reduce the inhomogeneity of laser energy. Adding the attenuator to the improved beam expansion system, the measured laser energy inhomogeneity is 9.31%. The measurement results show that the concentric ring-band gradient attenuator designed based on the diaphragm method is effective in reducing the inhomogeneity of laser energy and has certain engineering reference significance.