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Unstable surface gloss is a major quality bottleneck for calendered paper and high-gloss coated paper. Affected by uneven calendering pressure, inconsistent surface sizing, fluctuating workshop humidity and uneven fiber density, finished paper presents uneven gloss difference, including bright strips, matte areas and local gloss fading. Even if the initial gloss reaches the standard, paper surface gloss will fade rapidly after long-term storage and humidity erosion, failing to meet the permanent high-gloss demand of luxury packaging and high-grade picture printing. Most paper mills increase calendering pressure to improve instant gloss, but excessive pressure crushes internal fiber structure, reduces paper toughness, causes hidden cracking, and makes gloss attenuation faster in later storage. Single high-gloss sizing agent only improves surface brightness temporarily, cannot lock gloss for a long time. Shandong Ludao Energy Technology Co., Ltd. provides full-process gloss stabilization solutions. By compacting surface fiber arrangement, forming dense wear-resistant gloss protective layer, and improving surface humidity resistance, we realize uniform whole-page paper gloss, and slow down post-storage gloss fading speed effectively. The solution avoids gloss strip defect caused by calendering deviation, keeps long-term uniform surface luster, does not damage internal fiber toughness, improves high-gloss paper market added value, and meets high-standard aesthetic printing requirements.