本文从木材的微观结构出发，应用物理力学导出木材弦向和径向导热系数的理论表达式 ，计算20种左右木材导热系数并与相同条件下的实验值比较，平均误差在5%附近，两者吻合 程度令人满意。 Based on the microstructure of wood, the theoretical expression of wood chord and radial thermal conductivity was derived by physical mechanics. The thermal conductivity of about 20 wood was calculated and compared with the experimental data under the same conditions. The average error was about 5% Satisfactory degree of satisfaction.