The harm of gadolinium contrast agent on human body mainly includes two aspects: First, allergic reactions, which are relatively common, but most patients’ reactions are relatively mild, with symptoms such as facial flushing, accelerated breathing and various rashes, etc. A small number of patients may have serious reactions, such as a drop in blood pressure or even shock symptoms. Second, the impact of contrast agent on the kidneys, because the contrast agent is mainly metabolized by the kidneys, for patients with underlying kidney disease, such as diabetes, heart disease or chronic kidney disease, the risk of kidney damage after the use of gadolinium contrast agent will be significantly higher than that of ordinary people, so after the use of contrast agent patients need to drink a lot of water to promote urination, which is conducive to the discharge of contrast agent as soon as possible. This will help the contrast agent to be excreted out of the body as soon as possible.