Hiba (Thujopsis dolabrata) wood was treated with supercritical carbon dioxide (scCO(2)) at stepwise temperature increments from 50A degrees to 400A degrees C continuously so that extractives (dichloromethane-soluble and -insoluble phases) and solid residues were obtained. The yield of extractives from hiba wood increased with increasing extraction temperature. The volatile compounds in the dichloromethane-soluble phase from scCO(2) extraction at 50A degrees C contained only terpenoids. However, the volatile compounds in the dichloromethane-soluble phase from scCO(2) extraction at 300A degrees C not only contained terpenoids but also phenols, furans, hydrocarbons, and organic acids. The yield of beta-thujaplicin, which is a useful compound in hiba wood, increased with increasing extraction temperature from 50A degrees C to 300A degrees C; the optimal conditions for extracting beta-thujaplicin were 300A degrees C and 19.61 MPa. Further study of degradated compounds from the cellulosic and lignic materials of hiba wood after stepwise high-temperature scCO(2) treatment above 300A degrees C may provide clues to its efficient use.