Migration of chemical substances from paper and paperboard through plastic coating layer into foods contaminates foods and endangers people’s health.It is important to carry out theoretical and experimental researches on the migration of chemical substances.Analytical solutions were obtained based on one-dimension Fick diffusion theory by taking into account partition coefficient between paper and plastic （kCP） and different diffusion coefficients of paper and plastic （DP and DC）.The influences of various parameters

such as partition coefficient

diffusion coefficient

initial concentration of migrants in paper

dimensionless time

on migration behavior were analyzed.The results showed that the partition coefficient was critical to the migration of chemical substances in the functional barrier and foods.Diffusion coefficient of plastic DC had great influence on the amount of migrants in plastic and foods.On the contrary

the influence of diffusion coefficient DP on migration was not evident.The concentration of migrants in plastic and the amount of migrants in foods increased with increasing initial concentration in paper or paperboardMigration time reflected the migration trends of chemical substances in materials and foods.