The BuMA stent (SINOMED, Beijing, China) was a novel biodegradable PLGA polymer sirolimus-eluting stent (SES), with design of adding an electro-grafting (eG) base layer between the polymer and the stainless steel stent strut.The eG layer can secure adhesion of the biodegradable PLGA coating as a result of the interdigitation, and the PLGA coating ensures 100% drug release within 30 days.The initial investigation showed a high strut coverage rate in both the BuMA stent and the Xience V stent at 3 months follow-up. Moreover, earlier vascular healing after drug-eluting stent implantation may reduce the incidence of stent thrombosis at follow-up and potentially shorten dual antiplatelet therapy duration. Therefore, we performed this randomized trial to investigate 12 months target lesion failure between the BuMA and the EXCEL stent, both with same eluted drug sirolimus, however different biodegradable polymer carriers.