Poly(2-acrylamido-2-methylpropa-nesulfonic acid/acrylamide) superabsorbent resin was synthesized by microwave irradiation and charactered by means of FTIR.The impact factors of synthesizing superabsorbent resin, such as the ratio of monomer, the amount of crosslinker ,the amount of initiator , neutralization degree ,reaction time and microwave power, on absorption properties of liquid absorbency rate were discussed. Meanwhile, water absorption rate of resin was studied,the results showed that the water absorption rate of resin was 1495g/g in distilled water and 93g/g in normal saline respectively when the optimum conditions. However ,the absorbency was decreased sharply with increasing of salt concentration in solution,and with radius decreasing of anion copuled with potassium ion when the same concentration of salts in solution.Moreover, the water absorption rate had something to do with valence of cation for the electrolyte solution,the higher of the valence, the lower of the water absorption rate .