The ureter serves urine transfer from the kidney to the bladder. If problems such as stenosis or obstruction in the ureter occur, clinicians would like to insert a double J stent in the upper urinary system, from the renal pelvis to the bladder. Urine in the ureter smoothly flows with a help of hydrodynamic forces and peristalsis. When a double J stent is inserted in the ureter, peristaltic movement is reduced or eliminated. It is necessary to accurately understand urine flow in the ureter and to know the changes which could happen when a stent is inserted. Fluid structure interaction (FSI) simulation was used for the analysis. The FSI simulation is an appropriate method for finding the relationship between urine and a stent in the ureter. Previous studies have been conducted considering only the motion of the ureter. However, our study considered the motion of the ureter and a double J stent together and analyzed the movement of the stent by urine and its effect.