采用频域分段的方法 ,对强激光系统的波前畸变进行了理论分析 ;使用随机相位屏构建低频畸变波前模型 ,并提出采用迭代算法构建中高频畸变波前模型。使用构建的畸变波前模型作为输入 ,通过模拟计算 ,给出了色分离光栅对输入波前畸变宽容度的初步规律 The wavefront distortion in a strong laser system is analyzed theoretically by using the method of frequency domain segmentation. The wavefront model of low frequency distortion is constructed by using random phase screen, and an iterative algorithm is proposed to build the mid-high frequency distortion wavefront model. Using the constructed distorted wavefront model as the input, the initial law of tolerance of the input wavefront distortion is given through the simulation calculation