Soy protein has excellent nutritional and functional characteristics so it is widely used in food , but the commercial soybean often are irreversible thermal denatured in the preparation process like heatsterilization and spray drying at high temperature and high concentration, so its functional properties declined. Currently domestic institutions have done little research on thermal denaturation of soy protein isolate (SPI) in the spray drying . This paper had a systematic study on thermal denaturation and...