The ternary copolymer prepared with AMPS, methacrylic acid, and acrylamide is suitable for various saline slurries and can play a good high-temperature retarder role. The copolymer of AMPS and acrylic acid, as well as the composite of AMPS and N, N-dimethylacrylamide, and carboxymethyl hydroxyethyl cellulose, launched by Halliburton in the United States, can effectively reduce the high-temperature filtration loss of cement slurry as an additive for oil well cement.