根据大视场短波红外成像光谱仪的要求，考虑到市售探测器的限制，提出了视场分离的方法，分析了视场分离方法的原理.利用此方法设计了一个星载大视场短波红外成像光谱仪光学系统，该系统由11.42°远心离轴三反消像散前置望远系统和2个Offner凸面光栅光谱成像系统组成，运用光学设计软件CODE V和ZEMAX对成像光谱仪光学系统进行了光线追迹和优化，并对设计结果进行了分析，分析结果表明，光学系统在各个谱段的光学传递函数均达到0.7以上，完全满足设计指标要求.

Based on the requirements of shotwave infrared imaging spectrometer with wide field of view, considering the restrictive off-the-shelf detectors, a split field of view (FOV) method was developed. The principle of split field of view was analyzed. A spaceborne shortwave infrared imaging spectrometer with wide field of view was designed using the method. The imaging spectrometer are composed of a 11.42° telecentric off-axis three-mirror anastigmatic telescope and two offner convex grating spectral imaging system. Ray tracing, optimization and analyzing were performed by CODE V and ZEMAX software. The analyzed results demonstrate that the modulation transfer function for different spectral band is more than 0.7 which satisfies the pre-designed requirement.