A super absorbent resin based on acrylic acid has been successfully prepared by Ultraviolet Photo-initiated(UV) using polyvinyl alcohol as a crosslinlcing agent.The magnicide absorption amount of the resin for distilled water reached 4 100 g/ g and for sodium chloride solution in concentration of 0.9%，reached 405 g/g. The polymer was characterized by FTIR and TG. The effects of the quantity of water,time,pH,temperat ure,and fertilizer on the liquid absorbency of polyacrylate sodium in sandy soil and solution were then studied by indoor simulation experiment and the effects of polyacrylate sodium on the resistance water and germinating capacity were also investigated. Results showed that(1) the liquid absorbency rate in sandy soil was less than that in solution and the time of absorption saturation was longer than that in solution;(2) the effects of pH (4-10)，temperature (200-700)，and the nonelectrolytes fertilizer on liquid absorbency were rather small;(3) the liquid absorbency was heavily influenced by the electrolytes fertilizer;(4) the result of potted plant experiment showed that the poly (acrylate sodium) greatly improved exaltating seedling rate and soil water holding capacity.