Saturated steam pretreatment of hazelnut shells was studied for fermentable sugars after enzymatichydrolysis. The elevation of temperature (from 160 to 200 °C) and time (0–30 min) of steam pretreatment were investigated. Hemicellulose removal (%) gradually increased with increasing pretreatment temperature and time. 83 % of initial hemicellulose was removed when t e biomass was treated at 200 °C for 30 min. Maximum cellulose digestibility (46%) was obtained at the conditions of 180 °C for 30 min (46%). Glucose recovery ranged from 337 to 456 mg/ g initial solid.