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运用非平衡热力学理论分析了土壤非饱和区热湿迁移的热力学“力”和“流”，建立了迁移过程的热力学唯象方程。通过对土壤非饱和区热湿迁移机理的分析，利用扩散定律和气体状态方程推导了热湿迁移唯象方程中的有关唯象系数的数学表达式，分析了温度、含水率及蒸汽分压力对唯象系数的影响。
The thermodynamic “force” and “flow” of the heat and moisture migration in the unsaturated zone of soil were analyzed by using the theory of non-equilibrium thermodynamics, and the thermodynamic phenomenological equation of the process of migration was established. Through the analysis of the mechanism of heat and moisture migration in the unsaturated zone of soil, the mathematical expression of the phenomenological coefficient in the heat and moisture migration phenomenal equation is deduced by using the diffusion law and the gas equation of state. The effects of temperature, moisture content and vapor pressure on Effects of phenomenological coefficients.