Abstract:Small rice bran as raw material testing， research in rice bran extraction process small impact on the xylan and xylanase activity of the intestinal tract. On the basis of single factor， orthogonal experiment was used to optimize the extraction process of millet bran chitosan. The effects of four factors， such as ratio of material to liquid， alkali temperature， alkali concentration and alkali extraction time， on the extraction process were stud－ ied. And the xylanase activity was measured by the method of coloring xylan labeling to study the effects of millet chaffidan on intestinal fecal and xylanase activity in digestive tract.The results showed that the best extraction process was as follows： the ratio of material to liquid was 1∶25（g/mL）， the alkali treatment temperature was 100 ℃， the alkali concentration was 10 %， the alkali treatment time was 2 h， and the xylan was rate of 21.71 %.