Abstract: In order to capitalize on the buckwheat resources of Inner Mongolia and improve its value-added,this paper used buckwheat shells as the raw material, and enzymatic-chemical method to extract insoluble dietary fiber from buck wheat shell. The result of orthogonal experiments showed that the optimum extraction process was as follows: the concentration of -amylase was 0.3%, the time of alkali solution was 60 minutes, the temperature of alkali solution was 45, and the concentraintion of NaOH was 4%. The purity of dietary fiber was effectively improved by using this method.