Abstract: A process is described for extracting soybean proteins. The process includes the steps of: preparing a fat-free soybean meal which comprises water soluble and water insoluble proteins; separating the water soluble and the water insoluble proteins; introducing a protease to the water insoluble proteins so as to transform the water insoluble proteins to the water soluble proteins; and precipitating the water soluble proteins with an acid. The process has a better protein yield and a lower production cost than that of conventional methods because of the use of proteases. The product of this invention is superior to that made according to the conventional methods, with respect to the appearance of the product, water preservation ability, flexibility, scatter ability in water, emulsification ability, compendency, etc.