Abstract: To reveal the moisture variation pattern of finished cigarettes under different storage conditions and systematically evaluate the packaging moisture-preserving effect, a dynamic moisture migration model involving cigarettes and packaging materials was established. By integrating material diffusion theory with moisture sorption isotherms, the equivalent moisture diffusion coefficients of single-layer, multi-layer, and multi-surface packaging systems were analyzed, and kinetic equations for single-source (only cigarettes absorb moisture) and dual-source (cigarettes and trademark paper absorb and release moisture simultaneously) moisture transfer were derived. The model was validated through two sets of experiments: high-humidity environment with BOPP and low-humidity environment without BOPP. The results showed that: 1)In high-humidity environment with BOPP, both single-source and dual-source models achieve high fitting accuracy with errors less than 6% at each time point, with the dual-source model slightly outperforming the single-source model; 2)In low-humidity environment without BOPP, the dual-source model demonstrates significantly better fitting accuracy (RMSE=0.106%) compared to the single-source model (RMSE=0.239%), indicating that the dual-source model considering moisture absorption/desorption of the label is more consistent with actual conditions when packaging barrier performance is weak; 3)BOPP film plays a dominant role in moisture barrier performance for unopened packs, while after opening, the inner liner becomes critical, with aluminum-lined paper showing better moisture retention than transfer aluminum-lined paper. The smaller of the circumference of a cigarette, the rate of moisture change faster, and the higher requirements for packaging moisture retention performance. This study provides an experimentally validated theoretical model and quantitative evaluation basis for cigarette packaging design and moisture retention process optimization.