Objective：To explore the clinic value of Tei index in assessing right ventricular function of patients with TOF（tetralogy of Fallot） postoperatively. Methods：Totally 46 patients with TOF were enrolled and were divided into 3 groups according to the Tei index：Tei index <0.5（group A，n=13）；0.5≤Tei index <0.7（group B，n=19）；Tei index ≥0.7（group C，n=13）. Ejection fraction of left ventricle（EF） was measured. Right ventricle Tei index was calculated and ventilation time，ICU stay，positive drug time，drainage volume were recoreded. Results：There were statistical differences in ventilation time，ICU stay，positive drug time，drainage volume among three groups. Tei index was negatively correlated with ventilation time，ICU stay，positive drug time and drainage volume. There was no difference in EF among three groups. Conclusions：Tei index is a sensitive indicator of right ventricular function and is a valu－able and easy indicator in clinics.