Abstract:Xylooligosaccharides （XOS）are composed of xylose units，which widely exist in the nature of vegetables，fruits，milk and honey and are produced by main raw material of lignocellulose in industry processing.As edible source of dietary fiber，XOS has some biological activities involving improving intestinal health，strengthening immune and promising processing performances.So it has widely used in food，feed and other fields.In this paper，the production status，preparation and the application of XOS was stated and the research improvement was also illustrated.