Study of binding of the cationic surfactant molecule-N-dodecylpyridinium chloride (C(12)PyCl)-onto the anionic polyelectrolyte network-poly[2-(acrylamido)-2-methylpropanesulfonic acid] (PAMPS) gel-with different cross-linking densities was made and compared with that with Linear PAMPS. The experimental results showed that the presence of cross-linkage significantly enhances the initiation process but strongly suppresses the cooperativity of the binding. The binding process of the surfactant onto the charged network was interpreted in terms of osmotic pressure of the gel which results from the conformational shrinkage caused by the surfactant binding.