分析了照明系统中微透镜阵列的入射光线角度及系统像差对光学利用率的影响，提出了通过修正相关参数来优化照明系统的光学利用率以及照明均匀性的方法。通过改变用于光源聚光的自由曲面透镜的面型来缩小入射角度，从而减小了由于大角度扩散造成的效率损失。并且在微透镜阵列后采用两个球面透镜代替傅里叶透镜作为积分镜片，不仅成本低廉，而且在控制像差方面更为灵活。参数优化后，设计方案的光学利用率可达60.51%，均匀性可达94.24%，验证了理论分析的可行性和有效性。

With the analysis of incident angle and system aberration of microlens array, which would affect the illumination efficiency of the optical system, the optical efficiency and illumination uniformity are optimized. The efficiency loss which is caused by large incident angle is minimized by varying the curvature radius of the free-form double-lens. Two spherical lenses are used as Fourier integrator after the microlens array to increase the system efficiency. The simulation result shows that the optical efficiency and illumination uniformity are 60.51% and 94.24%, respectively, which proves the feasibility of the theoretical analysis.