At post - operative results, in intermediate AVSD group, 1.9% of patients showed severe mitral valve regurgitation, while 5.7% had moderate and 11.3% had mild mitral valve regurgitation; 7.5% with moderate tricuspid regurgitation; There were no cases of severe mitral valve regurgitation; no persistent atrial or ventricular septal defect; there was 1 case (1.9%) with type 3 atrioventricular block, then self - recovery; There was no mortality in our series.