”X-rays are part of the visible light of nature and are everywhere on Earth.” Taking a digital chest X-ray is only equivalent to watching 1 to 2 hours of television. In the past, fluoroscopy with the old X-ray machine radiation dose is large, most modern digital X-ray machine instead, radiation dose than before reduced; and now most hospitals use “film” to replace “fluoroscopy”, so the X-ray dose can be reduced by about 1 times. Medical X-rays have little effect on the body as long as they are applied reasonably. However, for sick children, pregnant women and women of childbearing age, the indications should be strictly controlled, and priority should be given to non-ionizing radiation examination methods. For those who do need X-ray examinations, hospitals will basically provide appropriate protective equipment and individual protection for sensitive organs such as gonads, eye crystals, thyroid gland and abdomen of pregnant women.