Research on the Clinical Effect of Shuanghe Decoction in Treating Unstable Angina.

Inclusion Criteria: * Participants diagnosed with coronary heart disease through coronary angiography or coronary CTA; Patients have at least one of these symptoms: 1. The stability of the nature of angina pectoris changes, that is, frequent attacks of angina pectoris, serious degree and prolonged duration; 2. Angina pectoris during rest; 3. The recent occurrence of angina pectoris caused by mild physical activity in the last month. Exclusion Criteria: * Patients diagnosed with stable angina; Patients with acute myocardial infarction; Chest pain caused by congenital heart disease, valvular heart disease, severe neurosis or arrhythmia; The heart function grade is III or IV; Patients with acute cerebral infarction; Patients complicated with other serious primary diseases; Patients with acute infection in recent 2 weeks; Uncontrolled hypertension (the resting blood pressure \>160/95mmHg within one week); Diabetics emerged with serious diabetic complications; Patients can't finish the questionnaire due to abnormal mental and nervous or mental disorders; Pregnant or lactating women.