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Anti-crack performance is a core toughness indicator for folding packaging paper, thin printing paper and post-processing paper. In the process of creasing, folding, die-cutting and low-temperature transportation, paper is prone to edge cracking, crease cracking and surface micro-cracks. The root causes include insufficient fiber toughness, short fiber length, loose interweaving structure and unbalanced stiffness and toughness. Crack defects not only damage the appearance of finished paper, but also greatly reduce the structural strength and service life of packaging and printed products. For high-end gift boxes and color printing products, cracking problems directly lead to product scrapping and order loss. Most traditional toughening technologies simply improve paper flexibility but reduce surface stiffness, resulting in soft paper body and poor shaping effect, failing to balance toughness and hardness. Shandong Ludao Energy Technology Co., Ltd. launches balanced anti-crack optimization solutions. By optimizing fiber interweaving tightness and building flexible and tough three-dimensional structure, we greatly improve paper folding and extrusion crack resistance without reducing surface stiffness. The treated paper has no crease cracking and edge chipping during high-speed post-processing, maintains excellent shaping effect and structural integrity, effectively reduces defective rate, and improves finished product grade and processing yield.