The main purpose of the excretory urogram (IVP) is to delineate the anatomy of the urinary tract. A clinical and radiological analysis, ospecially the measurement of the cortical scarring change was made by 101 case of acute pyelonephritis, 59 chronic pyelonephritis, and 100 normal adult cases. And we had significant result in analysis of radiological finding of chronic and acute pyelonephritis. 1. Female was more affected than male in about 4 times in acute and chronic pyelonephritis. 2. E-coil was most common pathogen in aucute and chronic pyelonephritis. 3. Common IVP findings of acute pyeloncphritis were ill-defined calyces, decreased density of pyelogram, and infundibular spasm. 4. The relative renal substance to kidney length is about 46.4% in normal Korean adults and significantly decreased in chronic pyelonephritis. 5. The distribution of scars follows several pattern. A single scar may occur anywhere but is most commonly found in the right upper pole than in the other poles. The most frequent scarring is generalized scarring. The right side is more affected than left side.