High kV chest radiographs are used to examine the lungs, especially for silicosis screening, diagnosis, follow-up, and for pneumoconiosis screening and epidemiological studies among dust workers. High kV chest X-ray uses a tube voltage of 120 kV or more to produce higher energy X-rays, and obtains X-rays that show rich layers in a smaller density range. It can protect the tube ball to extend the service life, and at the same time can reduce the radiation dose to the patient, increase the tube voltage value to shorten the exposure time, can reduce the distortion of limb movement, improve the clarity of the radiograph. It also reduces the tube current, reduces the heat generated by the X-ray tube, and improves the inhomogeneity of the optical density distribution due to the different tissue densities.