A new generation of water-resistant surface sizing agent, the product has the characteristics of small dosage, low cost and convenient use. It has good film-forming properties, significantly improves the surface strength of offset paper, electrostatic copy paper, white cardboard and other paper types, and achieves excellent water resistance. This product has good compatibility with various chemicals, and can be used with starch, direct dyes, Compatible with acid dyes, optical brighteners and other anionic or non-ionic substances.