After 3 - 4 week, there were 91% of patient alleviated the degree of hydronephrosis, and 39.4% of all patients were recovered to normal kidney. Conclusions: In patients underwent retroperitoneal laparoscopic ureterolithotomy with indwelling JJ stent, the degree of hydronephrosis was alleviated dramatically after 3 - 4 weeks. Therefore, we suggest that JJ stent should be removed after 3 - 4 weeks.