Abstract: To investigate the effect of fibrolytic enzymes on gastrointestinal morphological structure in kids, thirty healthy Boer male kids were chosen at similar birth weight to divide into two groups, the control and the treatment group (adding 0.2％ fibrolytic enzymes),and were weaned at 80-day old. Alfalfa hay were provided at 20-day old. Three kids chosen from each group were slaughtered at 2-, 3- and 4-month old, respectively. The results indicated that the length（P < 0.01）, width（P > 0.05） of rumjen papilla and surface area of rumen papilla per cm2（P < 0.01） were increased in the treatment group at the age of 3 and 4month, respectively, compared with control group, however the number of rumen papilla per cm2 was decreased （P < 0.01）. The fibrolytic enzymes increased significantly the villus length of duodenum at 3month age (P < 0.05）, and tended to increase the recess depth and mucous coat depth at the age of 3 and 4 month（P > 0.05）.