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This invention relates to the field of traditional Chinese medicine fermentation technology, specifically a method for preparing fermented Citrus reticulata peel that improves lung function and repairs lung cells. The method involves sterilizing crude Citrus reticulata peel powder with water to create a solid-state fermentation substrate, inoculating it with a composite seed liquid prepared from a mixture of Saccharomyces cerevisiae and Lactobacillus plantarum in a specific ratio. Solid-state fermentation is carried out under strict temperature and humidity control, supplemented by regular turning operations. The fermented material is then dried at low temperature and pulverized to obtain the final product. This complex biotransformation process specifically induces the generation of CSMI Citrus reticulata peel flavonoid-glucopyranoside, which is completely absent in the original medicinal material. This newly generated active ingredient produces a strong synergistic effect with the inherent components, significantly enhancing the overall efficacy in relieving cough and phlegm, inhibiting the release of inflammatory factors in the lungs, and repairing damaged lung epithelial cells. The resulting product can be directly used in the formulation of related pharmaceutical preparations and functional foods.