The synthesis of polymer complex based on sodium polyacrylate (PAS) with different mean degree of polymerization and polycation derived from poly(styrene 4 vinyl pyridine).The effects of the ratio of charge quantum between polycation and polyanion,charge density of polycation,molecular weight of PAS,added inorganic electrolyte such as sodium chloride on the formation of complex were studied.The interaction between the polycation and polyanion was studied by spectrophotometry and conductometric titration. The synthesis of polymer based on sodium polyacrylate (PAS) with different mean degree of polymerization and polycation derived from poly (styrene 4 vinyl pyridine). The effects of the ratio of charge quantum between polycation and polyanion, charge density of polycation, molecular weight of PAS, added inorganic electrolyte such as sodium chloride on the formation of complex were studied.The interaction between the polycation and polyanion was studied by spectrophotometry and conductometric titration.