为降低惯性约束聚变装置中大口径反射镜在重力作用下附加面型对光束质量的影响，对大口径反射镜镜背支撑技术进行了研究。经支撑结构优化，大口径反射镜由重力导致的附加面型从0.5 μm降为0.26 μm。对大口径反射镜镜体的打孔工艺、镜体与支撑架联接工艺及镜架结构进行了研究，并加工了样机进行验证，从实际测试结果来看，采用的反射镜打孔及粘结工艺对反射镜面型的影响可以忽略，反射镜镜架结构可以满足反射镜支撑要求，反射镜采用背支撑技术可以有效降低重力带来的附加波前。

To decrease the addition wavefront of large aperture mirror caused by gravity influence on beam quality in inertial confinement fusion facility, the back support technology is researched in this paper. By support structure optimization, the addition wave front caused by gravity of large aperture decreases from 0.5 micron to 0.26 micron. In this paper, the drill and the join technology of the mirror and support structure and the mirror support structure is researched and the prototype is developed to validate the technology. The test indicates that the wavefront of the mirror caused by the drill and join technology can be ignored and the mirror support structure can satisfy the mirror requirement. The addition wavefront caused by gravity can be well controlled by mirror back support technology.