0.05), correlation was better than those measured by transthoracic echocardiography (r=0.93, P<0.01). Trivial residual shunt was founded in 6 patients. Conclusions: TEE could clearly demonstrate the location, size and morphology of ASD. It was valuable for patients selection before the procedure, deployment of the Amplatzer occlusion device during procedure and evaluating the therapeutic effects. It was a safe and effective guidance technique. " v:shapes="_x0000_s1026">1852