Objective: To investigate the influence of long-term consumption of soybean on intestinal enzyme activity in mice,and to provide a basis for reasonable diet. Methods: The mice were divided into 1-month-old group( infant mice),6-month-old group( middle-aged mice),and 9-month-old group( aged mice) according to their age,and each group was further divided into control group,1/1 group,1/2 group,and 1/4 group using a random number table. The mice in the control group were given standard feed,and those in the 1/1 group,1/2 group,and 1/4group ...