Two kinds of soup were prepared and the total protein,crude fat,solid content and molecular weight distribution were detected in the paper.One kind was prepared by slow cooking in water,and the other was prepared by slow cooking in clay pot.The results showed that the protein content of these soups was between 7.80 percent and 22.98 percent,and the primary relative molecular weight distribution of the protein in the soup was greater than 10,000 Da.The highest oligopeptide content was chicken soup of 36.68 %.All the results showed that the soup has some nutrients,but people can not take enough energy and good quality nutrition only from soup.