Danhong Injection in the Treatment of Chronic Stable Angina

Inclusion Criteria: * Female or male inpatients. * Age: 18 - 70 years. * Patients with clinical diagnosis of chronic stable angina and must meet one of the following conditions:1）Patients who have a history of myocardial infarction and ST-T changes;2）Stenosis of more than 50% in at least one major epicardial coronary artery shown by Coronary Angiograph or CT Angiography; 3）Patients with coronary heart disease were determined by radionuclide angiocardiography. * Clinical diagnosis of "Xueyu Zheng" (Blood Stasis Syndrome) as the scores of Chinese medicine symptoms scales of "Xueyu Zheng" in angina ≥ 15. The Chinese medicine symptoms scales of "Xueyu Zheng" is defined as following (1)chest pain-10, (2)chest distress-10, (3) palpitation-5, (4)purple or dark lip-5, (5) purple or dark tongue-5, (6) unsmooth pulse-5. * Patients with moderate angina pectoris (The definition of "moderate angina pectoris " is in accordance with the Canadian Cardiovascular Society (CCS) grading of angina pectoris,which be classified to II or III. * Patient is willing to participate voluntarily and to sign a written patient informed consent. Exclusion Criteria: * Woman with pregnancy, lactation or positive result of pregnancy test, or woman who is under menstrual period. * Woman who disagree with contraception during treatment period * Patients with severe complications that would make the condition more complicated assessed by the investigator, including liver or renal dysfunction, severe cardiopulmonary dysfunction, pulmonary hypertension, chronic obstructive pulmonary disease, a history of epilepsy or cerebral hemorrhage . * Patients who were angina-free during the run-in period without taking any drug. * Patients with myocardial infarction or Canadian Cardiovascular Society (CCS) grading of angina pectoris class IV within the preceding 3 months * Patients with chest pain caused by other disease (e.g., acute myocardial infarction，severe neurosis，menopausal syndrome，hyperthyroidism). * Patients with history of drug-induced bleeding or history of bleeding caused by warfarin. * Patients with history of hematopoietic system diseases. * Patients who had surgery within the past 4 weeks and have hemorrhagic tendency. * Patients who is participating in other trials or has been participated in other trials in recent 3 months. * Patients with history of allergy or suspected allergic to the drug. * Patients who were suspected addicted into alcohol or drug abuse in the past 2 years. * Patients with mental disorder. * Patients who were unable to participate in the study as judged by investigator. * Patients who were family members or relatives of the research center staffs.