中国1.8 m太阳望远镜(Chinese large solar telescope，CLST)致力于对太阳偏振的高精度及高灵敏度测量。然而其系统本身会引入仪器偏振，并且在望远镜运行的过程中，仪器偏振会随其指向的变化而变化。这就降低了系统的测量精度。因此，需要一个偏振标定单元对其仪器偏振进行标定。为此，本文对偏振标定的原理和方法进行了研究，并且给出了针对CLST 的偏振标定单元设计方案。

It is the main task for the Chinese large solar telescope (CLST) with a 1.8 m aperture to measure the solar polarization with a high accuracy and sensitivity. However, the telescope system itself will introduce instrumental polarization. It also will change constantly with the rotating of the telescope and will reduce the accuracy. Therefore, a calibration unit is necessary to calibrate it. In this paper, we introduced the polarization calibration method and proposed a calibration unit structure.