Browse from Quercus aliena Blume, Quercus mongolica Fisch.. Quercus serrata Thunb., Quercus acutissima Carruth., Quercus variabilies Blume, and Quercus dentata Thunb. were analyzed for crude protein (CP). crude fiber(CF). neutral detergent fiber(NDF). acid detergent fiber(ADF). cellulose. lignin, in vitro dry matter digestibility(DMD), and tannin acid equivalents(TAE). According to the chemical composition and DMD. the total digestible nutrients(TDN). digestible energy(DE), and metabolizable energy(ME) were estimated. Oak browse samples were collected from May through October from 1990 to 1992 in Mt. Kyeryong. Browse from Quercus aliena, Quercus acutissima, and Quercus serrata contained higher levels of CP, DMD. TDN, DE. and ME. but lower levels of CF, NDF. ADF, and TAE as compared with other oak browse. Differences among seasons and years in the concentration of CP. NDF, and organic matter digestibility(0MD) were significantly appeared in all oak browse(P<0.05). The order of preference ratings of oak browse were Quercus aliena ) Quercus acutissima ) Quercus serrata ) Quercus mongollca ) Quercus variabilies ) Quercus dentata. As the results of this study, it could be considered that Quercus aliena and Quercus acutisslma were more valuable browse source than others.