P(HEA-co-6CQ) Polymers Hydrogels of four ratios was prepared by the UV polymerization, Using the tetraethylene glycol dimethacrylate as cross-linking agent. The temperature, time and electrolyte solution’s influence on the swelling behavior were studied. The result showed that the hydrogels has no strong reliance on temperature, and there is no obvious change on the swelling rate between the low temperature and high temperature. Swelling time has a less impact on hydrogels, but it can achieve swelling equilibrium about 4h. The effect of electrolyte solution on hydrogel is relatively large, and the swelling ratio is obviously lower than that in deionized water. The thermogravimetric analysis showed that the hydrogel was stable at 230 ?C. The product structure was characterized by IR and NMR spectra.