Abstract:The seabuckthorn pomace was treated with steam explosion technology.The conditions of pretreatment of seabuckthorn pomace by steam explosion were optimized by response surface methodology to improve the content of soluble dietary fiber from seabuckthorn pomace，and to compare the physicochemical properties of soluble dietary fiber before and after steam explosion.The results showed that the content of soluble dietary fiber in seabuckthorn pomace reached 24.74 % when the steam pressure was 2.0 MPa，the residence time was 88 s，and the particle size was 60 mesh，which increased by 246%compared with the control samples（7.14 %），and the water holding capacity，oil holding capacity，and swelling capacity of soluble dietary fiber after steam explosion were all significantly increased.Scanning electron microscope observation showed that the surface of soluble dietary fiber of seabuckthorn pomace after steam explosion was shrunk，curled and had holes.Experiments showed that the use of steam explosion treatment of sea buckthorn pomace，in order to increase its soluble dietary fiber content，so that the waste of seabuckthorn residue will be reused.