In the coating industry, cellulose ether is employed as a protective colloid, which can be used for vinyl acetate emulsion polymerization to improve the stability of the polymerization system in a wide pH range; in the manufacture of fine chemicals or products, additives such as pigments and fillers are used, cellulose ether can make them uniformly dispersed with stabilization and enhancement. It can also be used as a dispersant for styrene, acrylate, propylene and other suspended polymers to obtain latex paints with high thickening and excellent leveling properties.