Fifteen adult rex rabbits and fifteen rex rabbits at 15, 30, 60 and 90 d of age were selected respectively, and the pH, activity of amylase, trypsin, chymytropsin, lipase and lactase in duodenum, jejunum, ileum and caecum of rex rabbit were measured. The results showed that pH and the activities of digestive enzymes in different small intestine sections were different. The pH in each small intestine section had no singnificant difference when the rex rabbit was older than 15 days , and the pH of ileum was higher than that of the jejunum, and the pH of the jejunum was higher than that of the denum in the rex rabbits at the same age. Along with the growing of the rex rabbits, the activity of amylase, trypsin, chymotrypsin and lipase increased, and the activity of amylase, trypsin, chymotrypsin in the jejunum was the highest, followed by that in the ileum and duodenum in rex rabbits at the same age; the activity of lactase reduced gradually, and the activity of lactase appeared to be the highest in the jejunum, and then in the duodenums and ileums in rex rabbits at the same age. The pH, amylase and lactase activity in the caecum were lower than those insmall intestine and the activity of cellulose increased significantly after 60 d. The activities of digestive enzymes in the caecum were basically stable after 90 d.