There is some variability in the amount of time a double J-tube can be left in place, depending on the material and quality. A good quality anti-lithiasis double J-tube can be left in place for up to one year. Double J tubes are catheters that are used after surgery for urinary stones to support the patient’s ureter, relieve ureteral obstruction, dilate the ureter, and prevent ureteral stenosis. Depending on the quality of the ureter, there is a difference in the time of placement. Generally speaking, the double J tube is placed for no more than 2 months and can be removed in 4 weeks, but a better quality stone prevention double J tube can be placed for up to 1 year. Secondly, it can also be placed according to the patient’s condition to determine the time, if the ureteral stone surgery, can be placed for 1 to 2 months, if it is used for ureteral stenosis treatment, can be placed for about 6 months; for severe ureteral stenosis or recurrent stenosis patients, can be appropriately prolonged for about 1 year. During the treatment period, if any abnormality occurs, it is important to go to the hospital for consultation and treatment in time.