Objective:To explore the pregnancy complicated with hydronephrosis with or without cause and treatment of infection.Methods:58 cases of pregnancy complicated with hy-dronephrosis in 33 cases with conservative treatment in the Department of internal medicine,25 cases by Ureteroscope ureter catheter,using the method of ureteroscopy pneumatic lithotripsy in the treatment of +2 cases.Results:in 58 cases of renal colic symptoms were relieved in dif erent degree reduction,hydronephrosis,renal pelvis infections treatment remission,after the suc-cessful completion of pregnancy.Conclusion:mild and moderate hydronephrosis of pregnancy patients with renal colic,urinary tract infection after conservative treatment can obtain remission. Pregnancy associated with recurrent renal colic,associated with ureteral calculi or severe hydronephrosis were treated by ureteroscopy placement of double J ureteral catheter drainage ef ect is good;ureteral calculi patients with pregnancy ureteroscope reliable ef ect,less physical interference,the damage is smal ,is relatively safe for the fetus.