Rice bran oil contains various fatty acid, such as palmitic acid, linolenic acid, linoleic acid, oleic acid, stearic acid, tocopherol, squalene, etc. The oil including essential fatty acids was extracted from the domestic brown rice bran using supercritical carbon dioxide(SCC) process, and cosolvent addition process, respectively. And the extracts were analyzed with GC-MSD. The extraction amount of rice bran oil was dependent upon the operating pressure and temperature, and the fatty acid composition of oil was varied with the reduced density(ρ_γ) of the SCC. And it founded that the extraction amount was increased by addtion of cosolvent.