X-ray camera is a common means of clinical disease diagnosis, can make the human tissue structure imaging, economic and simple, wide range of applications and observations. Based on the thickness of different tissues and organs of the body, density, and sensitivity to X-rays, usually in the X-ray camera inspection can be fluoroscopic to bone tissue, muscle, parenchymal organs, and fat, gas and other tissues: 1, high-density tissue: bone tissue and bone tissue on the calcification point, high density, visible clear white shadow, can be used to observe whether the bone section of the examined area fracture or bone fracture, dislocation and other lesions; 2 2, medium density tissue: muscle, nerve, parenchymal organs, cartilage and body fluids and other tissue density is lower than bone tissue, gray-white shadow. The X-ray camera can be used to observe whether the morphology of the examined part of the organ is normal, whether disease occurs or other occupying lesions appear; 3, low-density tissue: fatty tissue and gas-containing tissue, such as low density, gray-black and dark black shadow on the X-ray film, can be generally clear whether the examination site is normal, or dynamic observation or judgment of the lesion site. X-rays are used to penetrate different densities and thicknesses of tissues and show different levels of light and darkness on the screen. It can make a general judgment of the diagnosed area of the disease, and the more subtle lesions are recommended to be examined by the relevant CT tomography.