The most common sequelae of Kawasaki disease in young children is the impact on the coronary arteries, manifested by coronary artery occlusion, stenosis or coronary artery thrombosis, or even coronary aneurysm rupture, which can lead to myocardial dysfunction and even life-threatening conditions, accounting for approximately 25% of cases. After early diagnosis of Kawasaki disease, timely treatment with aspirin or immunoglobulin can reduce sequelae and improve the prognosis of the child. In children with Kawasaki disease, cardiac function should be evaluated regularly during adolescence.