Corncob and other lignocellulosic biomasses,abundant renewable resources,can be used to produce some high-added-value products like xylose and xylitol after proper pretreatments.The pretreatment is to increase the efficiency of enzymatic hydrolysis and the production of reducing sugar.Normally,there are four type of pretreatment methods,i.e.,physical method,chemical method,physico-chemical method,and biological method.In this paper,the composition of corncob as well as the advantages and disadvantages of di...