提出了傅里叶望远镜外场实验系统拼接主镜支撑结构，详细介绍了各组件施工及安装过程.该主镜由61块六边形球面子镜拼接而成，高6 m，宽5.5 m，是我国目前用于望远镜系统中能量接收面积最大的拼接主镜.子镜采用模块化设计，互换性好且均可实现3个自由度的精密调整.支撑桁架采用分体结构设计，便于拆装和运输；地基采用混凝土浇筑预埋型钢构件，各分体组件由螺栓与地基联接为一个整体，保证结构整体刚度的同时，也满足系统对温度的适应性.通过实验验证：该主镜支撑结构稳定性优于0.075 mrad，子镜指向调整准确度优于0.05 mrad，对已安装的8块子镜进行共焦试验，光斑质心重合准确度小于20 mm，满足外场实验对拼接主镜的技术要求.

A supporting structure of segmented mirror for Fourier telescope field experimental system is proposed, and the fabrication and assemble sequence of each part are introduced. The segmented mirror, 6 meters in height and 5.5 meters in width, which is composed of 61 hexagon spherical sub-mirrors, is the biggest segmented mirror telescope used for energy collecting in China till now. The sub-mirror cell is designed in modular block so that it is interchangeable and its three FOD precision adjust can be realized. The supporting truss adopts fission structure for its assemble and transport to become easy. The ground base uses pre-embedded bar and beton. Each component joins with the ground base by bolts. In this way, the integer rigidity is ensured and the temperature adaptability is also satisfied. The experiment indicates that the stability of support structure is better than 0.075 mrad and the angle adjust accuracy is better than 0.05 mrad. The co-focus experiment of 8 segments which are already assembled indicates that superposition accuracy of spots center of mass is less than 20 mm. All the results above show that the proposed supporting structure satisfies the technical requirements of the field experimental system.