Each organ of body has many normal variations and/or abonormal development from fetus to adult especially urogenital system is very complex and markedly abnormal. The authors attempt to analyze the natures, incidences and differencies of each normal variations based on I.V.P. series of 1000 Korean females and the review of literatures were carried out. The results are as follows ; 1. The normal variations of urinary tracts are about 30 kinds as follows : Aplasia0/1000(0%), Hypoplasia 4/1000(0.4%), Atrophic kiney 0/1000(0%), Hyperplasia0/1000(0%), Hypertrophied kidney 0/1000(0%), Supernumerary kidney 0/1000(0%), Pelvic kidney 0/1000(0%), Wandering kidney 7/1000(0.7%), Horseshoe kidney 2/1000(0.2%), Nephroptosis 6/1000(0.6%) , Malroated kidney 0/1000(0%), Crossed ecotopic kidney 0/1000(0%), Ureteral kingking 440/1000(44.0%), Short ureter 3/1000(0.3%), Long ureter 49/1000(4.9%), Retrocaval ureter 0/1000(0%), Retroiliac ureter 0/1000(0%), Mega-ureter 0/1000(0%), Aberrant vessel in ureter 79/1000(7.9%), Congenital ureteral valves 0/1000(0%), Anomalous ureteral orifices 0/1000(0%), Double ureter 22/1000 (2.2%), Ureteral diverticulum 0/1000(0%), Extrarenal pelvis 170/1000(17, 0%), Intrarenal pelvis 830/1000(83.0%), Supernumerary pelivs 55/1000(55.0%), Renal backflow 2/1000(0.2%), Multiple calyces 1/1000(0.1%), Calyceal diverticulum 2/1000(0.2%), Unilateral fused kidney 0/1000(0%), Polar enlarged kidney 0/1000(0%). 2. The order of incidence of common varlations in Korean females are as follows ; 1. Intrarenal pelvis 2. Ureteral kingking 3. Extrarenal pelvis 4. Aberrant vessel in ureter 5. double pelvis 6. Long ureter 7. Double ureter 8. Wandering kidney 9. Nephroptosis 10. Hypoplasia 11. Short ureter 12. Horseshoe kidney 13. Renal backflow 14. Calyceal diverticulum 15. Supernumerary calyces.3. The most common variations in Korean females are intrarenal pelvis, extrarenal pelvis, aberrant vessel in ureters and most of them are acquired origin, Contrary, those in for igners are double pelvis and double ureter resulting form congenitla origin and the pattern is different form Koreans. 4. The most rare variation is multiple calyces in Korean femeals.