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Surface sizing is a key finishing process to improve paper surface performance and comprehensive quality. Unscientific sizing formulas and unreasonable sizing processes often lead to uneven sizing coverage, thin coating, poor permeability and low film-forming fastness. Unstable sizing effect will cause insufficient water resistance, poor surface strength, easy powder falling and poor printing adaptability of paper products, which cannot meet the requirements of high-grade printing and moisture-proof packaging. Many paper mills adopt excessive sizing agents to pursue performance, resulting in increased production costs, hard paper texture and blocked air permeability. Shandong Ludao Energy Technology Co., Ltd. provides refined surface sizing optimization solutions. By adopting high-efficiency low-dose sizing formulas and optimizing sizing speed and pressure parameters, we form a uniform, thin and dense protective film on the paper surface. This technology significantly improves paper surface strength, water resistance and printing performance without affecting paper air permeability and hand feel, reduces chemical consumption, and realizes high-efficiency and low-cost high-quality sizing production.