The presence of A-V shunting in hepatocellular carcinoma is an important factor for deciding the prognosis and in the management with transarterial chemoembolization. Twenty-four patients with hepatocellular carcinoma performed with $CO_2$-DSA and iodinated-DSA were reviewed for the evaluation of visibility of A-V shunting. IT was classified by the visibility into clearly visible, faintly visible and invisible. Also the authors evaluated neovascularity and tumor staining. And we checked side effects after the injection of $CO_2$ gas during $CO_2$-DSA. A-V shunting was wnoted in 19 cases (63%), which were clearly visible in 15 of 19 cases (79%) on $CO_2$-DSA and in 7 of 19 cases (37%) on iodinated-DSA. In 3 cases, A-V shunting was noted only on $CO_2$ -DSA. $CO_2$-DSA(17%) was inferior to iodinated-DSA in detection of neovasculaity and tumor staining. Side effects from $CO_2$-DSA were abdominal pain (1 case) and chest discomfort (1 cases) but improved within several minutes. In conclusion, $CO_2$-DSA is a sensitive and effective method for the detection of A-V shunting in hepatoma.