Objective　To study clinical value of ultrasoni c diagnosis in the congenital ureterostenosis. Methods　33 cases of ureterostenosis were measured with B-ultrasonographic examination, the resu lt of B-ultrasonographic examination was compared with the diagnosis of X-ray and surgery. Results　The localization rate and accord rate of B -ultrasonographic examination in diagnosis of ureterostenosis(obstruction) were 93.3% and 81.8% respectively. Conclusion　B-ultrasonographic examination in diagnosis of congenital ureterostenosis possesses greater advanta ge and better clinical value.