The convex palate is the clinical manifestation of the cranial bone lesion in Marfon syndrome. Mafangue syndrome is an autosomal dominant congenital connective tissue disorder with an incidence of about 1/10,000. The lesions can involve the skeleton, eyes, cardiovascular, lungs, skin and nervous system. So how do we initially check for the presence of Marfan syndrome? First we look for typical lesions of the cardiovascular system, including cystic degeneration of the middle layer of the ascending aorta leading to ascending aortic dilatation, aortic coarctation, aortic valve closure insufficiency, mitral valve prolapse, and endocarditis. Secondly, further detailed examination is needed. Such patients mostly show type II coarctation when complicating aortic coarctation, and a clear diagnosis can be made clinically based on typical performance and ultrasound and magnetic resonance examination. Those with aortic dilatation and aortic coarctation should be treated with surgery as soon as possible, including aortic aneurysm removal and artificial vessel grafting, as well as prosthetic valve replacement.