Wood drying stress and strain is the theoretical basis of making the optimum wood drying schedule. The drying stress model can describe the cause of generation of wood drying stress and it's developing regularity by mathematical method, and it is the theoretical basis which can accomplish the control technology of wood drying; therefore, it is theoretically important and practically significant to study wood drying stress model.The object of this paper was 30mm thick Pinus massoniana boards. The actual shri...