In order to improve the laser energy efficiency and beam uniformity in excimer laser refractive surgery, a novel laser beam shaping and homogenization system based on double lens array and a converging lens is designed. The prototype is evaluated by paraxial optics over a range of system parameters. A linear relationship is observed between the size of focusing laser spot and the spacing of double lens array. The overall length of the component can be changed by adjusting the distance between the lens array and the converging lens without affecting the final form of focusing spot. Ray tracing simulation method demonstrates the uniform square focusing spot on the back focal plane of the converging lens, and the change process of the focusing spot size depending on the spacing of double lens array. The impact of defocus on spot size and energy distribution is also analyzed. This beam shaping and homogenization system can meet with the quality requirements of focusing laser spot for excimer laser refractive surgery.