The peak of KD complicating coronary dilatation and coronary aneurysm is about 15 d into the course of the disease and does not occur at the same time point as the peak of KD fever. Most discharged children are still at risk for coronary dilatation and coronary aneurysm. The time to regression of moderate or higher coronary aneurysms is often measured in years, and in the subacute and chronic phases of KD, some coronary aneurysms can progress to intracavitary thrombosis or coronary stenosis, leading to myocardial infarction or even sudden death. Therefore, a proper KD follow-up strategy is very important. Referring to the KD follow-up guidelines developed by the Japanese Circulation Society and the American College of Cardiology, the following KD follow-up strategy is recommended: (1) In those who do not have coronary artery dilatation during the course of the disease or whose coronary arteries are only transiently dilated in the acute phase, oral aspirin 3-5 mg.kg-1 . d-1 can be discontinued after 8 weeks, (Shanghai Pediatric Cardiovascular Group recommends 3 months) without restricting daily activities. Follow-up physical examination, review of two-dimensional echocardiography (2-DE) and electrocardiogram (ECG) were performed at 4 weeks, 8 weeks, 6 months, 1 year and 5 years after the onset of disease. An additional stress ECG is recommended at the last follow-up visit. (2) Small to moderate coronary aneurysm: Oral aspirin 3-5 mg/kg/day should be treated until the coronary aneurysm disappears. The regression of coronary aneurysm occurs 1-2 years after the disease. the content and duration of follow-up within 1 year are the same as those without coronary artery dilatation and transient dilatation. if the coronary artery aneurysm is able to regress within 1 year, 2-DE and ECG are repeated annually thereafter until ascending to junior high school. If a cardiac stress test suggests cardiac ischemia or 2-DE suggests coronary stenosis, coronary angiography is recommended. Thereafter, follow-up including a stress ECG is performed every 4-5 years until progression to university. For residual coronary aneurysms, i.e., coronary aneurysms that do not resolve after 1 year of disease onset, follow-up with a stress ECG every 2-5 years and continuous treatment with aspirin or other antiplatelet agents is recommended after promotion to junior high school. Children in this category should not be restricted from daily activities after the 8th week of the disease course, and the decision to restrict physical activity or not should be made based on the results of the loading test. (3) Giant coronary aneurysms or multiple moderate coronary aneurysms. For those without coronary artery infarction, long-term anticoagulation with aspirin (3-5 mg.kg-1 . d-1) + favalin should be administered, with lifelong follow-up and individualized follow-up. For giant coronary aneurysms, daily activities should be limited and sports should be prohibited. ECG should be repeated at least once every 6 months and 2-DE and chest X-ray and stress ECG once a year, and coronary angiography should be performed if cardiac stress test or 2-DE indicates coronary stenosis. These giant coronary aneurysms are difficult to subside spontaneously, and coronary artery bypass surgery should be actively chosen if there are signs of cardiac ischemia. (4) Coronary artery stenosis (with ischemic manifestations), the follow-up is the same as that of giant coronary aneurysm, and physical activity should be limited and sports activities should be prohibited. Adhere to aspirin or other antiplatelet therapy. To prevent ischemia onset and heart failure, calcium antagonists, nitrates, beta-blockers, and angiotensin-converting enzyme inhibitors may be used as options. Coronary artery bypass grafting or appropriate coronary intervention may be considered if ischemic changes are significant as confirmed by stress ECG or stress myocardial perfusion.