Prevention of coronary heart disease is divided into three levels, primary prevention means prevention when there is no onset, secondary prevention means prevention after onset, and tertiary prevention means prevention of complications after onset, among which secondary prevention is the most significant, and relying on secondary prevention outside the United States has increased the average life expectancy by 4.6 years in the past 30 years. The main preventive drugs are aspirin, Tianxintai, coronary artery and other drugs. Our clinical emphasis on treatment rather than prevention is the main reason for the high recurrence rate of cardiovascular diseases in China. Preventive measures: 1. Carry emergency drugs with you. Such as nitroglycerin, to put the drug in the right hand easy to get to the pocket, once the angina attack can be taken, it can make angina to get rapid relief. 2, do not eat too much. After the meal should rest for at least an hour for digestion, because the post-prandial exertion can induce an angina attack. 3, under the guidance of the doctor for aerobic exercise. Gradually develop good physical strength and enable the recovery of heart function. However, it is dangerous to increase the amount of exercise on your own while exercising. In addition, outdoor exercise to choose a pollution-free environment, indoor exercise to maintain good ventilation conditions. 4, learn to relax. That is, to control emotions or reduce mental stress. Quit smoking and alcohol, and avoid tobacco smoke, so as not to aggravate angina. 5, make sure that from the diet or multivitamin supplements to get enough magnesium. Since many kinds of drugs can trigger angina, even if it is a minor illness, it is important to take medication under the guidance of a doctor.