介绍了装备在合肥扭摆磁铁光源上一条Ｘ射线光束线的设计，包括光学系统，设计参数，光束线上的两台主要设备前置环面聚焦镜和双晶单色仪．该光束线建成后将用于生物大分子晶体结构分析、高分辨Ｘ射线粉末和单晶衍射、多层膜结构以及在特殊条件下的Ｘ射线衍射与散射研究 The design of an X - ray beam line equipped with a torsion magnet in Hefei was introduced, including the optical system, the design parameters, the two main equipment front toroidal focusing mirrors and the twin crystal monochromator on the beam line. After the beamline is built, it will be used for crystal structure analysis of biological macromolecules, high-resolution X-ray powder and single crystal diffraction, multilayer film structure and X-ray diffraction and scattering under special conditions