White powder or granule, and can be divided into four types: non-ionic, anionic, cationic and Zwitterionic. Polyacrylamide (PAM) is a general designation of homopolymers of acrylamide or copolymerized with other monomers. It is one of the most widely used water-soluble polymers. It is widely used in oil exploitation, water treatment, textile, paper making, mineral processing, medicine, agriculture and other industries. The main application fields in foreign countries are water treatment, paper making, mining, metallurgy, etc.; At present, the largest consumption of PAM is for oil production field in China, and the fastest growth is for water treatment field and paper making field.