Stereoscopic three-dimensional echocardiography(S-3DE) is a novel displaying technology based on real-time 3-dimensional echocardiography (RT-3DE). Our study was to evaluate the feasibility and efficiency of S-3DE in the diagnosis of atrial septal defect (ASD) and its use in the guidance for transcatheter ASD occlusion. Twelve patients with secundum ASD underwent RT-3DE examination and 9 of the 12 were subjected to transcatheter closure of ASD. Stereoscopic vision was generated with a high-performance volume renderer with red-green stereoscopic glasses. S-3DE was compared with standard RT-3D display for the assessment of the shape,size,and the surrounding tissues of ASD and for the guidance of ASD occlusion. The appearance rate of coronary sinus and the mean formation time of the IVC,SVC were compared. Our results showed that S-3DE could measure the diameter of ASD accurately and there was no significant difference in the measurements between S-3DE and standard 3D display (2.89±0.73 cm vs 2.85±0.72 cm,P＞0.05;r=0.96,P＜0.05). The appearance of coronary sinus for S-3DE was higher as compared with the standard 3D display (93.3% vs 100%). The mean time of the IVC,SVC for S-3DE monitor was slightly shorter than that of the standard 3D display (11.0±3.8 s vs 10.3±3.6 s,P＞0.05). The mean completion time of interventional procedure was shortened with S-3DE display as compared with standard 3D display (17.3±3.1min vs 23.0±3.9 min,P＜0.05). Stereoscopic three-dimensional echocardiography could improve the visualization of three-dimensional echocardiography,facilitate the identification of the adjacent structures,decrease the time required for interventional manipulation. It may be a feasible,safe,and efficient tool for guiding transcatheter septal occlusion or the surgical interventions.