Calcium carbonate can be used as a white filler in coatings, or it can replace some pigments, play a role as a skeleton, and can also be used as a physical pigment. Since calcium carbonate is a white powder, it is cheaper than latex and solvent in coatings, and its particles are fine, so it can be evenly dispersed in coatings. At the same time, the addition of calcium carbonate can enhance the deposition and permeability of the primer on the surface of the base layer, so it is a physical filler and pigment that is widely used in the coating field. With the improvement of people's environmental awareness, water-based paints have been widely used in architectural decoration. Since calcium carbonate is white, hydrophilic, non-polluting, and cheap, it has broad application prospects.