红外光学系统决定着红外系统的工作模式与工作精度，影响系统的作用距离，是红外系统的重要组成部分。多视场光学系统可以用不同的视场对同一目标进行搜索、识别、跟踪与瞄准，在**应用领域获得了广泛的应用。光学系统的结构形式影响红外系统的成像质量、性能指标、外形尺寸、价格成本、机电复杂程度等，因此研究和选取合适的多视场光学系统结构形式显得非常重要。对目前国内外应用于凝视焦平面探测器的多视场红外光学系统结构形式，如切换变焦、光学补偿变焦、机械补偿变焦、混合变焦、双光路变焦等进行了特点分析，比较了其优点与局限性，对光学设计人员合理选用多视场光学系统结构形式具有一定的理论指导作用和意义。

The infrared optical system is the important part of infrared system, which can determine the working mode and working precision, and also can influence the working range of system. The multi-FOV optical system, which can be used in different field of view on the same object acquisition, identification, tracking and targeting, has obtained the widespread application in military field. The structural form of optical system has the effect on the infrared system imaging quality, performance, size, cost, and complexity. Therefore, the research and selection for an appropriate multi-FOV optical system structure form are very important. Structural features of multi-FOV infrared optical system for infrared focal plane array, such as rotate-zoom, optically compensated zoom, mechanically compensated zoom, hybrid-zoom, and the zoom of dual optical path are analyzed. Advantages and limitations are compared. This work has theoretical guidance and significance for the optical designer to select the structure of multi-FOV infrared optical system.