The association and properties of multi—block eopolymers(TP)of acrylamide(AM)and acrylic acid (AA)prepared by template copolymerization in aqueous solution were studied．The results showed that the copolymers of this type exhibited a significant structure effect compared with that of similar random copolymers(CP) obtained by copolymerization in the absence of template．Decrease the pH or add Ca2+ to the copolymer solution may cause phase separation．The TEM images demonstrated that the phase separation by adding Ca2+ was due to the formation of extensive intermolecular cross-linking．With increasing the pH of the copolymer solution the solution viscosity increased first and then decreased similar with that of the homopolyacrylie acid．However the increase range of template copolymer was higher than that of homopolyacrylic acid．TEM images indicated that at the maximal viscosity the template copolymer exhibited coiled aggregates．