Aiming at achieving the uniform projection of Gaussian beam in far fie ld,a miniaturized device consisting of a biconcave and a plano-convex lenses is designed and optimized w ith Zemax software.Based on the linear relationship between the illumination integral of an ideally uniform light spot in radial direction and its radius,a biconcave lens is utilized to shorten the light path,and then a plano-convex le ns is optimized by the constraint of linear relationship.Using the designed optical model with 24mm in length,the divergence of outputting beam with 1064nm wavelength and initial waist diameter of 400μm reaches to 6.6°.The performance of optimized Gaussian beam shaping system is simulated and characterized with dista nces of 10m,20m,30m and 40m.The obtained results show that the uniformity of light spot is bette r than 93.9%,and the utilization rate of optical energy is higher than 90% for all distances.As a simple structured system,the optical device,composed of two spheres and one quadric surface,has ±0.03mm tolerance of thickness and spacing,which is easy to process and convenient to apply.The newly-designed d evice also holds the potentials in various fields,such as laser communication and laser interference illumination.