Lipid tests include total cholesterol, triglycerides, HDL and LDL. The normal values of each index are 2.8~5.17mmol/L for total cholesterol, 0.56~1.70mmol/L for triglycerides, 1.04mmol/L for HDL and 3.12mmol/L for LDL. The main role of HDL is to get cholesterol from peripheral tissues, convert it to cholesterol esters under the action of lecithin cholesterol acyltransferase, and then transport it directly to the liver for further metabolism. Therefore, HDL can play a role in removing cholesterol from peripheral tissues, thus preventing the formation of atherosclerosis. LDL is metabolized from very low-density lipoproteins synthesized by the liver when transported in the blood, and its main function is to transport cholesterol produced by the liver to various tissues and organs. When there is an excess of LDL, it may be deposited on the walls of the arteries, eventually leading to the formation of atherosclerosis. When the blood lipid test exceeds the normal value range, it is important to go to the hospital in time and under the guidance of a specialist to carry out lipid regulating treatment.