Inclusion Criteria:  Over 18 years old; Presenting with stable or unstable angina and/or evidence of myocardial ischemia; The treated lesions were in situ coronary artery lesions. Angiography showed lumen diameter of 2.5-4.0mm and diameter stenosis ≥80%. No more than 2 lesions require treatment.  Exclusion Criteria:  Acute myocardial infarction within 48 hours of onset; Life expectancy of less than 12 months; Lesion in left main trunk, lesion length > 24mm, severe calcification, thrombosis or bifurcation; There are other lesions that require stenting.