In 31 cases of abdominal vascular lesions including aorta, inferior vena cava and portal vein, ultrasonographyand angiography were done at departement of radiology, Seoul National University Hospital, for recent 3 years forcomparative analysis of those findings. The results are ad follows: 1. There are 11 cases of abdominal aorticlesion such as atherosclerotic aneurysms and dissecting aneurysms, 12 cases of inferior vena cava lesion such asmembraneous obstruction and 5 cases of portal vein invasion due to hepatoma. 2. Ultrasonography revealed enlargedlumen and extent of the lesions in all cases of aortic aneurysm and showed intraluminal thrombus more accuratelythan aortography. 3. Intimal flap was detected in all case of dissecting aneurysm, however, ultrasonography couldnot show proximal extent and involvement of major branches. 4. In the cases of inferior vena cava obstructionultrasonography revealed obstruction site and extent of the leisons accurately but vena cavography depictedcollateral circulation better. 5. In 5 cases of angiographic portal vein invasion due to hepatoma, portal veinthrombus was detected in 4 cases by ultrasonography. And ultrasonography could not reveal collaterals,arteriovenous shunt and thread and streaks sign.