Abstract: In this paper, P(AA-AM-VAc)/OMMT superabsorbent composite resin was synthesized by aqueous solution polymerization based on acrylic acid(AA), acryamide(AM), vinyl acetate(VAc) and organic montmorillonite(OMMT). The optimal polymerization condition was achieved by investigating the effects of factors, such as polymerization temperature, monomer tatio, content of initiator, content of cross linker, neutralization degree of acrylic acid, and content of organic montmorillonite on the absorbency of the superabsorbent composite resin. The structure of the resin was characterized by Fourier transform infrared spectroscopy(FT-IR). The results showed that the water absorbency rate of the superabsorbent composite resin prepared under optimal condition was up to 695g/g for water and 113g/g for 0.9% salt water.