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Micro-crack defect is an invisible microscopic quality hazard that seriously affects paper fatigue resistance and long-term service life. Different from macroscopic cracks and crease fractures, paper micro-cracks refer to tiny fiber gaps and structural fractures inside the paper, which cannot be observed by naked eyes but exist widely in pressed and dried paper sheets. Under repeated bending, slight extrusion and seasonal temperature and humidity alternation, these micro-cracks will gradually expand and connect, eventually causing macroscopic fracture, strength attenuation and local damage. Micro-cracks are the main cause of premature aging of high-grade printing paper and long-term storage archival paper. Traditional strengthening treatments only repair macroscopic structural defects and cannot fill and repair microscopic fiber gaps. Long-term accumulated micro-crack expansion will lead to sudden paper breakage in post-processing and use process, bringing unpredictable quality risks. Shandong Ludao Energy Technology Co., Ltd. launches targeted paper micro-crack repair and inhibition solutions. By infiltrating and filling micro fiber gaps and reinforcing weak structural points, we repair inherent micro-crack defects and inhibit secondary crack expansion under external force. The solution improves paper fatigue resistance and structural compactness, eliminates hidden microscopic quality hazards, and greatly extends the service life and storage cycle of high-end paper products.