为了研究波像差对拼接的影响，采用模拟计算的方法对两对存在像差的子光栅的远场光斑特性参量进行了理论计算，在一定评价判据的基础上，得到了光栅的拼接精度。结果表明,当拼接子光栅的波像差为0.5λ的慧差时，其最大拼缝偏差约为0.42个光栅周期，最大角度偏差约为0.52μrad，均比无像差时的拼接要求有所降低，这一结果对制作大口径拼接压缩光栅是有帮助的。

To study effect of wave aberration on tiling results, far-field characteristic parameters for two-pair gratings with wave aberration were calculated by means of analogy calculation. On the basis of a certain evaluation criterion, the tiling accuracy of the mosaic gratings was obtained. Calculation results show that for the wave aberration with the coma of 0.5λ, the maximum piston-error of the tiling precision is about 0.42 grating period, and the maximum tip-tip error is 0.52μrad approximately, which are lower than those of gratings without wave aberration. The result is useful for preparation of large aperture compression mosaic gratings.