High-density lipoprotein has the function of preventing coronary heart disease and cerebral thrombosis, etc. A slightly high HDL in pregnant women may indicate that they have a regular life, do not stay up late, are in a happy mood, and have a low salt and low fat diet, which makes HDL synthesis more. However, long-term alcohol consumption and strenuous exercise can also cause high HDL. If pregnant women have this condition, they should pay attention to rest in daily life and avoid alcohol consumption. At the same time, increase the intake of nutrients in the diet appropriately and eat more high-quality proteins, such as chicken and fish, to ensure the healthy development of the fetus. High-density lipoprotein is one of the serum proteins, consisting of lipids, proteins and the regulatory factors it carries. It is valued as an atherosclerosis prevention factor because it can export cholesterol and promote cholesterol metabolism. HDL transports cholesterol from surrounding tissues and then converts it into bile acids or excretes it directly from the intestine through bile. Arteriography has demonstrated a negative correlation between HDL cholesterol content and the degree of arterial lumen narrowing. Therefore, HDL is an anti-atherosclerotic plasma lipoprotein and a protective factor for coronary heart disease.