Objective To describe the ultrasonic image features of TAPVC and compare the differences between obstructed and non-obstructed TAPVC before and after surgery. Methods A total of 112 TAPVC patients were assessed, including77 boys and 35 girl. The patients were divided into two groups, 34 obstructed patients and 78 non-obstructed patients. The echo were performed before operation, 1month and 6 months after operation to evaluate the heart structure and function and the anomalous pulmonary venous．The left and right ventricular end diastolic diameter (LVD&RVD) were measured with M-mode ultrasound. The tricuspid valve regurgitation maximum pressure gradient（PTR） and the flow velocity of pulmonary vein were respectively measured with and pulsed-wave and continuous Doppler.Test the ventricular diameter and PTR before and after surgery and the comparison between groups. The mortality and incidence of pulmonary venous obstruction (PVO) was analyzed. Results The rate of TAPVC diagnosis by echocardiography was 100% and 89% of accuracy. The month age and weight at surgery of obstructed group were lower than non-obstructed group (P <0.001). One month after surgery, LVD and LVD/RVD of all two groups patients were lager than before operation，RVD and PRT was lower (P<0.01). There were no statistically significant difference between the two groups of PTR and LVD/RVD one month and six month after surgery (P >0.05). The mortality of obstructed group was higher (11.8% vs 0%，P<0.01).The incidence of pulmonary venous obstruction after surgery has no significant statistical difference (17.6% vs 6.4%，P>0.05). Conclusions Echocardiography is valuable in the diagnosis of TAPVC, with acute assessment of classification, pulmonary pressure, the degree and position of pulmonary venous obstruction. Baby with obstructed TAPVC need early diagnosis and timely treatment. However prognosis of both groups’ patients was good. What’s more, the incidence of pulmonary venous obstruction after surgery has no significant statistical difference between groups.