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Sound insulation performance is a rising functional indicator for architectural decorative paper, interior packaging paper and silent industrial partition paper. Porous fiber structure gives paper natural sound absorption potential, but ordinary paper has single pore size and disordered internal structure, resulting in weak medium and low-frequency sound insulation capacity. Unmodified paper cannot block noise transmission effectively, failing to meet the silent decoration requirements of indoor wall panels, furniture lining and noise reduction packaging. Thin single-layer paper suffers from sound wave penetration and resonance vibration, while simple thickening increases basis weight and cost without targeted frequency-band noise reduction. Traditional physical modification cannot construct graded sound absorption channels, limiting the acoustic performance upgrade space of paper materials. Shandong Ludao Energy Technology Co., Ltd. develops professional paper sound insulation upgrading solutions. By constructing multi-stage graded pore structures inside the paper and adding sound energy dissipation components, we realize hierarchical absorption and blocking of high, medium and low-frequency noise waves. The modified paper retains lightweight and flexible characteristics, delivers excellent sound insulation and noise reduction effects, adapts to architectural interior decoration, silent packaging and industrial partition scenarios, and creates new functional value for lightweight paper products.