The main diagnostic criteria of angina include: 1, symptomatic manifestations: chest tightness and chest pain, accompanied by palpitations and panic; 2, electrocardiographic changes; 3, coronary CTA; 4, coronary angiography: the gold standard for the diagnosis of angina, using the principle of contrast agent, into the coronary arteries for coronary CT, coronary DSA photographic image, the degree of confirmation is higher, when the imaging results are negative, angina is less likely to develop; positive imaging results, stenosis of more than 75%, for severe angina.