This product is a kind of anionic polyelectrolyte, poly carboxylic acid, is a kind of fine scale inhibitor and dispersant, even in alkaline conditions also have good dispersion capacity. This product can be microcrystalline type sediment of calcium carbonate, calcium phosphate, calcium sulfate dispersed in water precipitation, so as to achieve scale, this product with organic corrosion inhibitor compound and practical, has obvious synergistic effect.