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Humidity-induced paper shrinkage is a key difficult problem that plagues high-precision paper processing and batch quality stability. Paper fibers are highly hygroscopic; when the ambient humidity rises or drops sharply, fibers will absorb water and expand or dehydrate and shrink, causing transverse and longitudinal dimensional changes of paper sheets. Uncontrolled paper shrinkage leads to serious problems such as inaccurate printing overprinting, die-cutting size deviation, sheet warping and edge waviness, which greatly increases the defective rate of high-end printed products and customized packaging products. In seasonal climate alternation and air-drying workshop environments, paper shrinkage fluctuation is more obvious, resulting in inconsistent batch product sizes and unstable delivery quality. Traditional improvement methods rely on simple humidity adjustment and surface sizing, which only work temporarily and cannot fundamentally improve fiber moisture sensitivity. Once the external environment changes, shrinkage deformation will recur. Shandong Ludao Energy Technology Co., Ltd. launches long-acting anti-shrinkage optimization solutions. By modifying fiber moisture absorption characteristics and building stable internal structural constraints, we inhibit abnormal water absorption expansion and dehydration shrinkage of fibers, effectively reduce transverse and longitudinal shrinkage rate. The treated paper has low humidity sensitivity, maintains stable dimensional accuracy and flatness in variable environments, ensures precise overprinting and die-cutting processing, and solves batch specification deviation caused by seasonal humidity changes.