由于离轴三反射镜系统拥有视场大、无色差、适用温度范围宽、对材料无限制、无中心遮拦、可轻量化设计等一系列优势，在航天遥感中正被越来越广泛地应用。结合常用光学设计软件ZEMAX的Macros 功能，通过将自己编写的ZPL 宏指令加入系统评价函数中来限制离轴三反优化过程中的挡光问题，并给出了具体的设计、使用步骤。

With a lot of advantages such as wide field, free of chromatic aberration, no obscure, good temperature adaptability, etc, Off-axis TMA has been more and more widely used. This paper introduced a ZPL macros to describe and prevent obscure in Off-axis TMA, an example to show how to use it is also given.