This agent is a scale inhibition and dispersant, particularly suitable for water with high content of metal oxides, silicon, and scale-forming salts. It exhibits high scale inhibition efficiency and does not form insoluble polymers through flocculation with residual flocculants or aluminum, iron ions, and silicon compounds. Using this product in the system can reduce the equipment investment and operating costs of reverse osmosis (RO), nanofiltration (NF), or ultrafiltration (UF) systems.