The scale and corrosion inhibitions of PAPEMP have been studied. The results show that the PAPEMP has better effect on scale and corrosion inhibitions than other compounds. The permissible content of calcium ions is obviously improved. A great deal of industrial water is needed in Shanghai Petrochemical Area. The calcium ion content，total alkalinity，chlorine ion content are all comparatively high in this kind of water. In such a water quality condition，we must exploit and apply highly efficient water treatment chemicals. Therefore，PAPEMP has been used to improve the concentration ratio by Acrylic Fibre Plant，Shanghai Petrochemical Co.，Ltd. Pretty good results have been obtained.