If angina occurs, you should: 1. stop the original activity, sit down or lie down on the spot to rest and relax, then take nitroglycerin or musk heart pills, compound danshin drops, yindanxintai drops and other emergency drugs; 2. if the pain or chest tightness is not relieved or not reduced in 5 minutes, please repeat the application of the above drugs; 3. if the above symptoms are not relieved in 15 minutes, myocardial infarction should be considered to have occurred. Try to stay calm, relax and call 120 for an ambulance; 4. If the traffic allows, the patient should be sent to a hospital with cardiac monitoring and interventional treatment as soon as possible for early revascularization.