Through aqueous radical polymerization,one novel scale inhibitor of terpolymer has been synthesized by choosing itaconic acid( IA),N-hydroxymethyl acrylamide( N-MAM),and sodium methylallyl sulfonate( SMAS) as monomers,persulfate ammomium as initiator. After single-factor experiment on factors affecting the scale properties of the copolymer were optimized. The optimum synthesis conditions of IA/N-HAM/SMAS are as follows: n( IA) ∶ n( N-MAM) ∶ n( SMAS) = 2. 2 ∶ 1. 0 ∶ 1. 0,amount of initiator was 10% of monome...