As one of the chemical and experimental study on cancer treatment in Korea oriental medicine, we investigated the clinical characteristics on the treatment of cancer patients in oriental medical hospital. Furthermore, we carried out the cytotoxicity test of extracts of herbal medicine. The results are as follows: About Clinical Aspects of the Orient낄 Medical Cancer Treatment- (1) Clinical experience is that 420 Oriental medical hospitals were surveyed. Number of cancer patiens treated by one oriental medical doctor was under 10(about 60%)or from 10 to 20(about 30%). (2) Diagnostic Procedure Is that more than 80% of cancer patients were diagnosed by medical doctor of western hospital. (3) Therapeutic Method is that combination of oriental and western medical treatment was used in oriental medical hospital. (4) Relationship between cancer and constitutions is that to the relationship between cancer and constitutions, about 75% responded and most were considered to be Um. About Experimental Study- Toevaluate the direct cytotoxicity of hot water and methanol extracts of 34 oriental medical prescriptions on stomach cancer cell, SRB assay was carried out. (1) The $IC_{50}$ value of water extract of Samsoum was $19{mu}g/ml$ and that of methanol extract was $15{mu}g/ml$ so that we confirmed Samsoum has a strong direct cytotoxicity. (2) The $IC_{50}$ values of water extract of Coptidis Rhizoma, methanol extract of Caesalpiniae Lignum and Draba Semen were $10{mu}g/ml$, $9{mu}g/ml$ and $12.5{mu}g/ml$ respectively, so that we confirmed Coptidis Rhizoma, Caesalpiniae Lignum and Drabs Semen have a strong direct cytototoxicity. (3) The $IC_{50}$ lalue of combinatory prescription of Rhei Rhizoma, Forsythie Fructus and Caesalpiniae Lignum was about $40{mu}g/ml$