Abstract:Soybean products are rich in nutrients，but one of the anti-nutritional factors hinder the absorption of nutrients.Six different pulping processes were used to prepare soybean milk and tofu for five kinds of raw material beans respectively.Protein content in soybean and soybean milk as well as the yield of soybean milk and tofu were determined.By analyzing and comparing the relationship between different soybean varieties and pulping process and the yield and protein content of soybean products，soybean products with high yieldand high protein content were selected from the aspects of soybean product yield.The activity of soybean trypsin inhibitor was detected by ultraviolet spectrophotometer.The low soybean trypsin inhibitor activity of the varieties and the pulping process of processed soybean products were obtained.The activity of trypsin inhibitor in soymilk and tofu made by different soybean varieties using different pulping process was significantly different，which provide theoretical basis for the processing applicability of different soybean varieties and industrial production.