Danjiangkou Hydroproject is the waterhead project of South-North Water Diversion. The anti-permeable grouting curtain of Danjiangkou Dam was constructed almost 40 years ago.The water pressure would become larger after the dam was heightened. So the durability of grouting curtain should be evaluated objectively by the corresponding tests. In this study, the conventional and accelerated aging tests were completed. The quality of the acrylamide gel and the change of amide group, as well as the concentration of ammonium ion and content of acrylamide monomer in the aging solution were measured before and after aging. The test results indicate that the amide group of side chain of acrylamide gel was hydrolyzed after aging tests, but the main chain of acrylamide gel was not. The durability of acrylamide gel was proved to be good by the results of the tests.