Inclusion Criteria:  Age must be 18-80 years, males or females. Subject with stable angina, or unstable angina, or recent myocardial infarction (myocardial infarction occurred more than 7 days before enrolled into the group), or asymptomatic myocardial ischemia with evidence Coronary angiopathy in situ with stenosis of more than 70% with visually estimated (or more than 50% combined with symptoms of ischemia, TIMI ≥ 1) in a vessel with visually estimated reference vessel diameter (RVD) ≥ 2.0 mm and ≤ 2.75 mm in small vessel group,and ≤ 26 mm in length or RVD ≥ 1.75 mm and < 2.0 mm in very small vessel group, and ≤ 16 mm in length. Target small vessel lesions are located on one or two different coronary arteries (RCA / LAD/ LCX). The number of target small vessel lesions on each coronary artery is no more than one, and each target small vessel lesion can only be treated with one test instrument The number of non-target lesions requiring early interventional treatment is no more than two, and the distance between them and target lesions must be > 10 mm; Successful treatment of non target lesions is required before subjects are randomized and the test equipment(DCB) cannot be used for the treatment. Subject can receive any type of coronary revascularization (including balloon angioplasty, stent implantation or coronary artery bypass grafting) Subject can understand the study objectives and voluntarily participate in and sign the informed consent; subject must agree to clinical follow-up and angiographic follow-up at 9 months.  Exclusion Criteria:  AMI within 1 week. In stent restenosis, complete occlusion or severe calcification (unable to pre expand successfully with balloon) Left main artery disease or bifurcation disease with diameter >2.00mm requiring interventional treatment Evidence of massive thrombi in the target vessels Severe heart failure (NYHA IV) Severe renal failure (subject with GFR < 30ml / min or undergoing hemodialysis) Subject with vein graft restenosis after bypass surgery or severe heart valve disease Pregnant or nursing subjects Life expectancy less than 12 months Subject with bleeding tendency, history of active peptic ulcer, suffered stroke within the past 6 months, contraindications of antiplatelet preparation and anticoagulant treatment Subject is currently participating in another investigational drug or device study that has not yet completed its primary endpoint. Subject has undergone heart transplantation Known allergy to aspirin, clopidogrel, heparin, contrast media, and paclitaxel. The investigator judged that the subject's compliance is poor and can not complete the study as required.