Modification was taken on soybean dietary fiber through ultra-fine pulverization in wet processing to aim for the problem that the physical properties and function of nature dietary fiber are under perfect. We strived to get perfect dietary fiber in function, and in the same time we could strengthen retention rate and expansion rate and viscosity of dietary fiber based on maintain its original properties of packing and adsorption.The microstructure of raw stuff and particles which had been soaked in water a...