According to a query on the official website of Nanning Weikang Medical Equipment Co. Ltd, the validity period for the use of X-ray protection supplies such as lead clothing protective suits is 4 to 5 years. The national standard of 4 to 5 years refers to the lead suit in the correct use of the case of no physical damage to the formulation. The higher the frequency of use, the faster the decay of lead equivalent, reasonable use of lead clothing can be close to the theoretical life.