The present invention discloses a synbiotics feed additive, which is mixed and made by the useful viable, APS, non-digest oligosaccharide and the carrier according to a certain proportion. The presentinvention has the highlight advantages that the feed additive comprises many compositions which are useful for intestinal health and contains plant polysaccharides; which can effectively replace theantibiotics, compared with antibiotic, which is non-toxic, non-drug residues and beneficial for the health of animal and human, using the addictive can promote animal growth, improve feed conversion efficiency and reduce the incidence of disease.