The extraction technolgy of insoluble dietary fiber from wild Zingiber strioatum by alkali solution was investigated,The effects of ratio between material and solution,concentration of alkali,temperature and time on the extraction ratio were studied.The optimal extractions conditions were obtained by L 9(34) orthogonal methodology.Optimization of water insoluble dietary fiber extraction conditions: it was concluded that water insoluble dietary fiber of the best extraction technology for: feed liquid than 1∶45,alkali concentration 0.25 mol/L,leaching temperature 52 ℃,extracting time 100 min,under optimized conditions,the extraction rate of water-insoluble dietary fiber was 90.73%,swelling ratio of insoluble dietary fiber was 8.6 mL/g and its holding water capacity was 2.315g/g.It was proved the wild Zingiber strioatum of fanjing mountain was a good material to extract dietary fiber.