Abstract:Five methods，includingacid-alkali，ultrasound-assisted alkali，microwave-assisted，double-enzyme，and ultrasound-assisted enzyme extraction，were compared to prepare the insoluble dietary fiber（IDF）from the residue of Cyclocarya paliurus leaves after polysaccharide extraction and the physicochemical properties and antioxidant activity of IDF were measured.The infrared spectrum showed that the IDF extracted by the five methods all had the characteristic absorption peak of cellulose polysaccharide，and the peak shape was similar.The IDF extracted by the acid-alkali method and the ultrasound-assisted alkali method had higher expansion rates，and that extracted by the ultrasound-assisted alkali method had a better water holding capacity and oil holding capacity.The IDF extracted by different methods had variedantioxidant activities.Based on the DPPH free radical scavenging rate，hydroxyl free radical scavenging rate，and ferric ion reducing antioxidant power，the IDF extracted by microwave-assisted method had a higher antioxidant activity.