LDL is the most important risk factor for patients with coronary heart disease, among which LDL is more closely related to the occurrence of coronary heart disease. LDL can enter the intima of coronary arteries and oxidize into oxidized LDL, which is eaten by macrophages. With the aggravation of the disease, it causes the narrowing of coronary artery lumen, which eventually leads to the occurrence of coronary heart disease. Patients with elevated lipids, especially elevated LDL, should be actively controlled through diet and other lifestyle modifications, and if necessary, lipid-regulating drugs should be given to prevent the occurrence of coronary heart disease. For patients with coronary artery disease, it is also important to actively bring LDL up to standard to prevent the progression of coronary artery disease.