The crystal is the only device for X-ray band spectroscopy. The crystal and energy satisfy the Bragg equation. Scanning and selection of different energies can be achieved by rotating the crystal angle. Conventionally produced crystals are usually flat and have the ability to split light but cannot image. The crystal can be bent through a special process, which can increase the imaging function of the crystal device and improve the light collection efficiency of the instrument. It has a wide range of applications.