It is a newly developed multifunctional binary copolymer dispersant. The copolymer molecular chain contains both strong acid and weak acid groups, which has an excellent effect on calcium phosphate. In addition, it also has a good dispersion effect on zinc hydroxide, zinc phosphate, iron oxide, sediment, and calcium carbonate. Especially, it has excellent performance in temperature resistance and calcium compatibility, so it is very suitable for use in high-temperature, high pH value, and high calcium hardness cooling circulating water systems. It is generally used in combination with commonly used scale and corrosion inhibitors such as polyphosphates, organic phosphates, and zinc salts to increase the effect of dispersing sediments.