During the weaning transition of pigs compromising alterations in gastrointestinal architecture are common.After weaning the extent of alterations in gastrointestinal architecture is different 42.piglets were selected from pigs weaned at28days old to determine the alterations in gastrointestinal architecture during7days post weaning.Intestinal samples were taken from proximal small intestine midsmall intestine and distal small intestine.Every day from d0to d6postwaning.Villus height and crypt depth were measured the data demonstrated that during the first4d postweaning.Villus height shortened and crypt depth deepened.And Villus height was shortest on d4postweaning and began to return on d5postweaning.