We designed water soluble copolymer for corrosion inhibition effects in aqueous enviroment. This copolymer was pursued for the goal of environmental adaptability. Water soluble copolymers were prepared from methoxypolyethylene glycol methacrylate (MPEG-MA) and acrylic acid units. We polymerized 5 to 65wt% of methoxypolyethylene glycol methacrylate and 95 to 35wt% of acrylic acid monomers by azobisisobutyronitrile (AIBN) and sodium peroxodisulfate in organic and water media, respectively. The solution containing these copolymers was evaluated inhibition of corrosion effect for steel materials. These results suggested that combination of MPEG-MA and acrylic acid in polymerizing in water media was most effective to inhibit corrosion for steel materials. It is important to contain 4 to 6 mol unit of ethylene oxide side chain in MPEG-MA.