For medium/high-risk coronary heart disease patients undergoing non-cardiac surgery, the aims of routine preoperative coronary angiography and revascularization are improving risk stratification and reducing the risk of perioperative adverse cardiac events, though the effects remain not yet clear. Some studies suggest that the patients with symptoms and/or non-invasive examination showing the presence of coronary heart disease may require invasive coronary angiography before non-cardiac surgery, and if necessary, revascularization. Recent guidelines indicate that routine coronary angiography or revascularization before surgery is required routinely for the patients with acute coronary syndrome undergoing non-cardiac surgery, while for those with chronic coronary syndrome, the angiography or revascularization is only for high-risk populations (with poor drug treatment and/or high-risk lesions), and the optimal treatment plan for non-high-risk lesions is not clear yet.