Abstract: The aim was to efficiently recover water-soluble dietary fiber in soybean meal by means of blasting extrusion processing-complex enzyme hydrolysis. Soybean meal by oil enzymatically produced was firstly sprayed and blasted,then hydrolyzed by cellulase and α-amylase,and its process parameters were optimized by response surface methodology. The results showed that the yield of water-soluble dietary fiber was the best,which was 26.03%±0.02% after the air blasting-complex enzymatic modification treatment of the explosion temperature at 220℃,the blasting time at 30 s,the cellulose:α-amylase(g:g)at 2:1 and the enzymatic time at 2 h. Scanning electron microscopy observation of modified soybean meal structure was loose and the arrangement was more regular.