Bladder tumors initially may be diagnosed by excretory urography. In this study, 60 excretroy urograms including 40 cases of biopsy proved tumor and 20 cases of cystoscopically normal bladder were analyzed. Five experienced readers reviewed five radiographs of each case. The results were as follows : 1. Male to female ratio was 5.7 : 1, and the highest incidence of age distribution was between 60 and 69 year with 48 %. 2. The tumors were chiefly located in lateral wall of blader(67%). 3. Among 40 cases, pathologic diagnosis was as follows: Transitional cell ca. 39 cases, and squamous cell ca. lcase. 4. The I.V.P findings showed 82% of normal upper urinary tract , 13% of hydronephrosis, 5% of non-visualization, and 58 % of filling defect in bladder. 5. Orginal interpretation of urogram was as follows : Of 40 cases with bladder ca. 45% as positive, 13% as suspicious, and 38% as negative. Of 20 cases with normal , 95% as regative , and 5% as positive. 6. Anlaysis by this study w s as follows : Accuracy 685 , sensitivity 62%, specificity 80%, false positive rate 38% , and false negative rate 20% . 7. 25 minA-P radiograph was most valuable projection , and oblique projection did not significantly increase sensitivity.