风载引起的主镜变形是大口径望远镜必须考虑的问题。针对类似于 Subaru望远镜的薄镜面能动光学系统，采用固定点力反馈控制方法对风载进行校正，本文引入了压强模式的概念，提取出风载产生的镜面变形的大部分信息，并据此对固定点力反馈控制方法进行了研究，得到如下结论: 风载产生的镜面变形主要是平移、倾斜、像散和离焦等低阶像差；相同系数的情况下，平移和倾斜压强模式可以产生更大的镜面变形，对固定支撑点产生更大的力；基于压强模式的固定点力反馈控制方法对风载有较好的校正效果。

One of the critical considerations for large telescopes is primary mirror distortions caused by wind load. In thin-mirror active optic systems such as Subaru Telescope, the fixed-point Force Feedback (FFB) algorithm is used to suppress wind load. The concept of pressure mode is brought up and the majority information of distortions caused by wind is extracted. The FFB algorithm based on pressure mode is studied and the following conclusions are drawn: aberrations caused by wind consist mainly of piston, tilt, astigmatism and defocus; with equal coefficients pressure modes of piston and tilts produce larger aberrations and push more forces on fixed points; the FFB algorithm based on pressure mode can suppress mirror deformations introduced by wind.