Redispersible polymer powder is mainly used in: interior and exterior wall putty powder, tile adhesive, tile grouting, interface agent, exterior insulation mortar, self-leveling mortar, repair mortar, decorative mortar, waterproofing mortar, dry mix mortar. In the mortar, the purpose is to improve the brittleness, high elastic modulus and other weaknesses of traditional cement mortar, and to give the cement mortar better flexibility and tensile bonding strength to resist and delay the occurrence of cracks in the cement mortar. Since the polymer and mortar form an interpenetrating network structure, a continuous polymer film is formed in the pores, which strengthens the bonding between aggregates and blocks some pores in the mortar. Therefore, the hardened modified mortar has better performance than cement mortar. There is a big improvement.