The main reason of the deformation of particleboards in differentmoisture conditions is uneven distribution of moisture content in the particle-board,It is necessary to study the processes of moisture transfer for control-ling the deformation of particleboard. First,the moisture unsteady-state diffusion coefficients and surface emissioncoefficients of particleboards were determined experimentally in this study. Then the processes of moisture transfer in particleboards were analyzed andthe moisture distributions of particleboards which were stored under differ ent moisture conditions were predicted by using the numerical method thecombination of finite element method(LEM)and finite difference method(FDM)Finally,the results of computation were proved by experiments。