24 patients with unresectable hepatocellular carcinoma were treated with transcatheter arterial embolization. The results were as followings: 1) The serum levels of AFP were decreased in about 80 percent of the patients with elevated AFP. 2) We found the low density areas in the CT after embolization which meant the effect. 3) Side effects were fever, nausea and vomiting in almost of all patients but subsided within several to ten days.