The main component of PAM is propylidene amine, which is mainly used for rapid agglutination and sedimentation of suspended particles in water. Adding this agent according to the charge characteristics can play the best role of adsorption bridging and achieve the effect of condensation and separation of suspended particles in water. According to the characteristics and density of charge, this product can be divided into three specifications: anion, cation and non-ion. It can be used as coagulant aid, retention aid, sludge dewatering agent and agglutination settling agent. It has strong functionality, wide applicability, and can effectively improve operation efficiency and reduce operation cost. In addition to being used as general drinking water and municipal wastewater treatment, it is also widely used in the purification of discharged water from metals, dyeing and finishing, food, electronics and other industries.