Polyacrylamide hydrogel is kind of typical hydrogel, which is characterized by three-dimensional structure and high chemical stability. Because of the positive amino group in the structure, the surface of polyacrylamide hydrogel is positive. Considering the porous structure of acrylamide hydrogel, it can adsorb and remove inorganic and organic pollutants in water through the combination of capillary attraction and electrical attraction. Therefore, polyacrylamide hydrogel has the potential to be used for sewage purification. At this point, the mechanical properties of the gel become extremely important. Based on this, this paper focuses on the interaction between the amount of acrylamide as well as the agent and the mechanical properties of hydrogel.