High-density cholesterol means HDL cholesterol, which is derived from the synthesis of celiac particles in the liver and small intestine and surface matter from the degradation of very low-density lipoproteins. It can facilitate the removal of cholesterol from peripheral tissues and transport cholesterol to the liver and other tissues for redistribution. HDL cholesterol is negatively associated with coronary heart disease. It is the only lipoprotein in the body that has anti-atherogenic properties. Apolipoprotein a1 predominates among the HDLs, accounting for about 65%-75%. Some research data show that for every 0.4 mmol/L increase in serum HDL cholesterol, the risk of coronary heart disease is reduced by 2%-3%. HDL cholesterol greater than 1.55 mmol/L is considered to be a protective factor for coronary heart disease. If HDL cholesterol is elevated among blood lipids, no special treatment is needed because it is a beneficial factor for the body.