Xylanase( E. C. 3. 2. 1. 8) is a kind of enzymes which can breakdown the linear polysaccharide β-1,4-xylan into xylose,xylobiose,or xylotriose. At present,xylanase is the most widely used in the pulp and paper industry,especially in the pulp bio-bleaching. The enzyme has very extensive application value and great exploitation foreground,thus,more and more researchers have begun to pay attention to this aspect. At the same time,some of them have started to study the application of xylanase in food processing in recent years,in order to develop largescale applications of xylanase in the food industry and also to speed up the process of xylanase industrialization in China. This article mainly introduces the nature of xylanase,along with the application in food industry such as flour products production,xylo-oligosaccharide production and so on. And also analyze the problem in the application of xylanase the industrial production,as well as the perspective of its application.