Solubilities of evening primrose oil(EPO) in supercritical carbon dioxide were measured at tempera-tures of 20-50℃ and pressures of 100 to 300 bars. Solubilities of EPO were found to increase with increasing pressure at constant temperature. When pressure was kept constant, solubilities of EPO decreased with increase in temperature at pressures of 100 to 200 bars, while they increased with higher temperatures at 300 bar. Solubilities at 250 bar were of a constant value. The effects of temperature and pressure on the extraction yield coincided with the tendency in sol-ubility. Under the range covered in this study the highest yield of extraction was 21wt% at the temperature of 50℃ and the pressure of 300bar with the flow rate of carbon dioxide of 3.5-4.0l/min(STP). Loading of oil in supercritical carbon dioxide was constant until the extraction yield based on available oil was less than about 50%, and then it de-careased sharply. The average loadings increased with increase in residence time. Mass transfer parameter, k_c, a, increas-ed linearly with the superficial velocity of carbon dioxide in the extractor.