Abstract: Wild Zingiber strioatums in Fanjing Mountain were materials and ultrasonic method was used, based on 4 fundamental single factors, these were power extraction, temperature and time and ratio of material to liquid, by means of L9 (34) orthogonal test, process conditions were optimized about water-soluble dietary fiber of Wild Zingiber strioatums. The results showed that the optimal technique conditions were extraction time was 39min, ultrasonic power was 120W, extraction temperature was 63℃ , solid -liquid ratio was 1∶41g/mL. Under these optimum conditions, the SDF extraction rate was 3.33%.