Hepatectomy has been a treatment of choice for hepatocellular carcinoma and metastatic liver carcinoma. Recurrence in residual liver after hepatectomy is clinically a serious problem. Since 1987, postoperative hepatic arterial infusion chemotherapy using subcutaneously implanted reservoir has been undertaken to improve the prognosis after hepatectomy in hepatocellular carcinoma and liver metastasis of colorectal carcinoma. The indications for reservoir implantation were determined for high-risk cases in hepatocellular carcinoma and all cases in liver metastasis. The tip of a catheter was placed at the root of the common hepatic artery via gastroduodenal artery. Lipiodol-ADM was injected for hepatocellular carcinoma every 2 months and MMC-5-FU was injected for liver metastasis of colorectal carcinoma every one or two weeks. Complications of this procedure in every 2 cases of reservoir infection proved to be catheter obstruction and hepatic artery obstruction. In the process of this treatment, we observed 3 recurrences in residual liver of hepatocellular carcinoma and one case of peritoneal dissemination and 3 recurrences in residual liver of liver metastasis of colorectal carcinoma. All are still alive.