Polyacrylamide emulsion is a new polymer material made of acrylamide through special process polymerization since 1960s. The polyacrylamide emulsion is by a polymerization reaction in which a water-soluble monomer (acrylamide) is dissolved in an aqueous phase and dispersed in a non-polar liquid by means of an emulsifier to form a water-in-oil type emulsion. Inverse Emulsion Polymerization is a way that water-soluble monomer has the same high polymerization rate and high molecular weight as conventional emulsion polymerization. This could enables efficient polymerization of water-soluble monomers into a milky polymer and the reaction temperature is smooth and easy to control which could reduce the cross-linking and branching reaction. The product molecular weight can be free to adjust and is conducive to the application. The drag reduction agent is the most important component in the slick water fracturing fluid system. When the polyacrylamide emulsion is used as the drag reducing age...