In 31 cases of abdominal vascular lesions including aorta, inferior vena cava and portal vein, ultrasonography and angiography were done at department of radiology, Seoul National University Hospital, for recent 3 years for comparative analysis of those findings. The results are as follows: 1. There are 11 cases of abdominal aortic lesion such as atherosclerotic aneurysms and dissecting aneury는, 12 cases of inferior vena cava lesion such as membraneous obstruction and 5 cases of portal vein invasion dut to hepatoma. 2. Ultrasonography revealed enlarged lumen and extent of the lesions in all cases of aortic aneurysm and showed intraluminal thrombus more accurately than aotography. 3. Intimal flap was detected in all cases of dissecting aneurysm, however, ultrasonography could not show proximal extent and involvement of major branches. 4. In the casess of inferior vena cava obstruction ultrasonography revealed obstruction site and extent of the lesions accurately but vena cavog aphy depicted collateral circulation better. 5. In 5 cases of angiographic portal vein invasion dut to hepatoma, protal vein thrombus was detected in 4 cases by ultrasonography. And ultrasonography could not reveal collaterals, arteriovenous shunt and thread and streaks sign.