Several properties of a PAAm/SA gel were investigated with changing cross-linker concentration including the point at which the gel becomes cloudy. It was observed that the volume changes in swelling in pure water and shrinking in ion-capturing process is considerably suppressed above the cloudy point. By considering the factors governing the gel volume, the authors estimated that the largest change can occur in the network elasticity, which was also confirmed by a simple elasticity experiment. In addition, in order to investigate the influence of such a change on nanostructure, the authors also measured cross-linker fraction dependence of the SAXS profile of the PAAm/SA gel and observed that the SAXS profile of the PAAm/SA gel with the higher cross-linker concentration shows a steeper initial slope, which indicates a larger structure in the PAAm/SA gel with higher cross-linker concentration. Beside, the SAXS profile of dehydrated NIPA/SA gels with different cross-linker concentration was also observed because it is known that the dehydrated NIPA/SA gel shows an environment-sensitive peak in the SAXS profile. In the measurement, the SAXS profiles of the dehydrated NIPA/SA gels with the cross-linker fractions around the cloudy point show a drastic change, of which the behavior can be also explained by the increase in the network elasticity.