In this paper , the contents were as follows : ( l ) on the base of non - equilibrium thermodynamic theory and phase equilibrium principle , a nonlinear mathematical model of porous media ' s drying was established . the coupled heat and mass transfer phenomena was considered enough in the model 该模型充分考虑了多孔介质内部传热传质之间的相互耦合现象,从化学势的定义出发,进一步从理论上分析了温度、含湿量对各唯象系数的影响。