Diffusion is the main migration form of moisture in wood below fiber saturation point(FSP)and the main driving forces of moisture diffusion are the gradients of moisture and temperature.Correctdiffusion models with different scalescontribute to description ofmoisturedynamic migration in drying process.Therefore,the paper summari-zes the moisture diffusion in wood from the perspectives of diffusion form,diffusion mechanism and diffusion models with different scales,analyses the problems andattempts to give suggestions and references on model construction and application.%木材在纤维饱和点(FSP)以下干燥时,内部水分主要是以扩散的形式迁移;水分扩散的主要动力是含水率梯度和温度梯度。不同尺度扩散模型的建立可以更好地描述干燥过程中水分的动态迁移。从水分扩散形式、扩散机理和不同尺度的扩散模型3个方面总结了木材干燥过程中水分扩散的研究进展,提出模型研究中存在的问题及相应措施,为扩散模型的建立和有效应用提供参考。
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