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Light transmittance difference is a key precision quality defect for tracing paper, gift thin paper and medical translucent paper. Even if the overall transmittance of finished paper meets the standard, single-page local transmittance deviation and batch transmittance fluctuation will seriously affect product use effect. Local excessive light transmission causes light leakage and poor shading performance, while low transmittance areas lead to uneven light presentation, affecting the precision of tracing and optical detection. For high-standard translucent special paper, transmittance inconsistency will directly lead to product downgrade and order failure. The main causes include uneven fiber density distribution, irregular micro-pore structure and inconsistent filler dispersion. Traditional process adjustment can only control average transmittance but cannot solve microscopic local deviation, making it difficult to achieve full-page and batch optical consistency.Shandong Ludao Energy Technology Co., Ltd. launches targeted light transmittance balance solutions. By homogenizing paper internal pore structure and fiber density distribution, we eliminate local light transmission difference and stabilize batch transmittance indicators. The solution ensures uniform and stable optical performance of translucent paper, meets the precision requirements of tracing, medical detection and high-end decorative thin paper, and improves product market qualification rate.