Abstract: Objective To supply the clinical applied anatomic data for locating the ureteropelvic junction (UPJ). Methods The urinary system specimens of 32 fixed adult cadavers were used for general measurement and then, the middle part of renal pelvis(RPSUB>mid/SUB>), UPJ and the middle part of ureter(URSUB>mid/SUB>) were taken for HE and nevre fibers sliver staining and the histological features were observed. Meanwhile, the staining images of the three parts were analysed and measured by computer. Results The outer diameters of UPJ(3.12±0.81)mm, was among the shortest one of three outer diameters. Similarly, the inner diameter of UPJ (2.26±0.15)mm, was respectively shorter than that of RPSUB>mid/SUB> or URSUB>mid/SUB>(EM>P/EM><0.05) .The nerve fibers were less in UPJ and RPSUB>mid/SUB>,whereas, the collagen fibers were relatively richer in muscular fascicles of UPJ. The smooth muscles arranged irregularly in UPJ . Both the wall (0.63±0.04)mm and the muscular layer (0.34±0.03) mm of UPJ were thiner respectively than those of RPSUB>mid/SUB> and URSUB>mid/SUB>（EM>P/EM><0.05）. The average value of renal incline angle was 61°. Related the angle, the general position of UPJ was about 1.2-1.3 cm above the plane extended horizontally from renal inferior extremity (PSUB>inf/SUB>). The larger the incline angle(θ) was, the higher the UPJ located in. Conclusion The location of UPJ is generally about 1.25cm above PSUB>inf /SUB>.There are physiologic intracavitary narrow and co

Key words: Ureteropelvic junction, Constriction, Location, General measurement, HE staining, Sliver staining, Images analysis, Adult cadaver