介绍了弧矢聚焦双晶单色器系统性能要求 ,详细分析了满足系统性能要求的光学设计、机械设计和控制系统设计方案。具体介绍了单色化和压弯聚焦等光学设计 ,Bragg角的转动和固定高差的移动等关键部件的机械设计 ,以及以直圆柔性铰链为基础的投角、滚角、摆角调节结构 The performance requirements of sagittal focusing twin crystal monochromator system are introduced. The design scheme of optical design, mechanical design and control system to meet the system performance requirements is analyzed in detail. The mechanical design of the key components such as monochromatic and buckling focus optical design, Bragg angle rotation and fixed height difference movement, as well as the angle, roll angle, swing angle adjustment structure based on the straight flexible hinge