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Anti-capillary penetration performance is a key precision water resistance index different from conventional surface sizing water resistance. Paper has natural capillary pore channels formed by fiber gaps. Under long-term humid environment and micro-water pressure, water molecules will penetrate upward along capillary channels, causing internal moisture diffusion, even if the paper surface has no obvious water drops. Capillary penetration leads to hidden internal fiber moisture absorption, resulting in slow strength attenuation, internal mildew, layered bulging and long-term storage deformation. This defect is extremely prominent in vertical placed paper, bottom stacked paper and long-term humid storage paper. Traditional surface waterproof treatment only blocks surface water and cannot inhibit capillary micro-pore water conduction, resulting in delayed water damage defects after long-term storage. Shandong Ludao Energy Technology Co., Ltd. launches targeted anti-capillary penetration optimization solutions. By modifying internal pore capillary performance and cutting off micro-water conduction channels, we fundamentally inhibit water molecule capillary infiltration and internal diffusion. The solution retains paper air permeability, eliminates hidden internal moisture damage, and greatly improves the long-term humid storage stability of packaging and cultural paper.