 Patients were enrolled and randomized to be treated by JANUS or SRNCRO bare metal stent with the same platform as JANUS. All enrolled patients received daily clopidogrel for 4 months and aspirin for life long for post-PCI periodIn AMI group, patients received daily clopidogrel 150mg for 2 weeks at first. The primary endpoints included death of heart, myocardial infarction, revascularization of the target lesson, sub-acute and late stent thrombosis one year after PCI, The secondary endpoints included MACE at 30 days, 6 months and restenosis by follow-up angiogram at 6 to 12 months. 