LDL cholesterol in patients with coronary heart disease should be controlled at <1.8mmol/L. The main cause of coronary heart disease is coronary artery atherosclerosis, the main risk factor for atherosclerosis is the elevation of LDL levels, patients with coronary heart disease should be controlled at LDL levels <1.8 mmol/L. Patients with coronary artery disease should undergo routine blood lipid examinations, and patients with elevated LDL levels should be treated with statins, such as simvastatin and atorvastatin, and blood lipid tests should be strengthened during the course of medication. For patients with high LDL levels, a combination of drugs is needed, with the addition of ezetimibe, a drug that inhibits the absorption of cholesterol, and especially severe patients need to be injected with eloxacinumab. Coronary heart disease patients with elevated LDL cholesterol should promptly go to the hospital, under the guidance of the doctor standardized treatment, so as not to delay the condition.