Polyacrylamide (PAM) is a linear water-soluble polymer with the properties of flocculation, thickening, shearing, resistance-reducing and dispersion, etc. It is widely used in the fields of oil drilling, mining, coal washing, papermaking and water treatment, etc. The product can be divided into four kinds by the ion characteristic: APAM (Anionic Polyacrylamide), NPAM (Nonionic Polyacrylamide), ZPAM (Zwitterionic Polyacrylamide), CPAM (Cationic Polyacrylamide).