The view of Carrier Fertilizer was put forward in this paper, and the key step to research this fertilizer lies in searching or synthesizing the higher functional molecule material. The controlled release tablet containing a natural polysaccharide and urea was initially studied. The results showed: Mixing of this natural polysaccharide and urea led to significantly control over urea release. Further research of IR analysis and X-diffraction analysis showed: Natural polysaccaride(NP) interacted with urea, which came from the interaction of hydrogen bond or covalent bond, and the these bonds made fertilizer carrier system of á-helix or high molecule network from the interaction of NP and urea came into being.