Abstract: The effect of soybean protein properties on fibrosis products by high moisture extrusion was investigated.And defatted soybean flour, soy protein isolated and five kinds of soybean protein were used as the main materials.The factor on the properties of fibrosis products by high moisture extrusion was investigated, including the nitrogen solubility index (NSI) , particle size and the different ratio of 7S/11S of the materials.The result showed that the properties of the materials had significantly affected on the sensory qualities, rheological properties and microstructures of fibrosis products by high moisture extrusion.The fibrosis structures of extrusion products were better under higher NSI value and lower particle size (0.076～0.135mm) of the materials and 11S glycinin played an important role in the extrusion processing.The quality of fibrosis products by high moisture extrusion could be improved by increasing the content of 11S glycinin.