The role of clopidogrel: first, inhibit the ADP-mediated platelet aggregation in human body, can be used as a primary prevention drug for coronary heart disease, with hypertension, diabetes, hyperlipidemia, smoking history, obesity in patients who meet three or more need to take oral to prevent coronary heart disease; second, can also be used as a secondary prevention drug for coronary heart disease, with coronary heart disease can be taken orally clopidogrel combined with aspirin to improve the prognosis; third Third, it can be used as a routine drug after coronary artery stenting, combined with aspirin drug duplex antiplatelet aggregation, with a year to improve the prognosis; Fourth, it can be used to treat acute cerebral infarction and other cerebrovascular diseases and peripheral arterial disease.