Abstract: Effects of ionic liquid volume，sulfuric acid amount，microwave irradiation time，microwave irradiation temperature，microwave irradiation power on dilute acid hydrolyzed saccharification of corn straw in ionic liquid ［Bmim］Cl by microwave irradiation were investigated.Results indicated that the best conditions of acid hydrolysis were as follows：microwave irradiation temperature 85 ℃，microwave irradiation time 60 min，microwave irradiation power 600 W and sulfuric acid amount 10.0%，and the yield ratio of reducing sugar could reach 21.36% obviously higher than traditional dilute acid hydrolysis method.