Abstract: A superabsorbent resin poly(acrylate sodium) was synthesized by ultraviolet photo-initiation of sodium acrylate with polyvinyl alcohol as a crosslinking agent. The resin was characterized by means of FT-IR and TG. Besides, the swelling dynamics, reversibility and swelling behaviors in different temperatures，different pH solutions, different ionic concentrations and diverse organic solvents were studied. Experimental results show that water absorptions of the resin in distilled water and in NaCl solution(w=0.9%) could reach 4 100 g/g and 405 g/g, respectively. And the impacts of external saline solutions on the water absorbency for the composite were correlated with the valence of cation, and the result is NaCl>CaCl2>FeCl3. The diffusion of water into the resin were nonFickon characterized with 0.5＜n＜1.