In papermaking industry, Carboxymethyl Cellulose CMC can be used in pulp-making process to enhance the residence and wet strength; in surface sizing, it can act as the excipient of pigment to enhance the internal cohesive power, reduce printing dust and improve the printing quality; in paper coating, it is beneficial for the dispersion and flow ability of pigment and can enhance the finish, smoothness, optical performance and printability. In general, the suggested dosage is 0.3-1.5%.