Abstract:Optical coherence tomography (OCT) which provides high-resolution images of the coronary arteries can allow us to demonstrate clearly culprit lesion morphologies about the types of plaque and find out the vulnerable plaque, to identify the extent of stent malapposition and assess the proportion of uncovered struts and guide the stents implantation. These years OCT has made a great progress.The article reviews the research status in this aspect.