It is the ideal high-efficiency pigment dispersant in the industries such as water-based latex paint, coated paper processing etc. It is superior to the currently used inorganic dispersants in terms of stability over time, aging stability and dispersion effects for dispersing pigments or paint dispersions. It is easy to use and has a wide range of uses. It can be made one high-concentration, low-viscosity pigment by adding a small amount. It also has a unique dispersing effect on ultra-fine heavy calcium carbonate and light calcium carbonate, which is the difficult to disperse in coatings. Besides, it can increase the concentration of pigments in coatings, improve production efficiency, and obtain significant economic benefits.