Abstract: Civil Engineering，Shandong University，Jinan，50016，P.R.China. Our study analyzed the macro-mechanical properties and fracture mechanism of wood and established the multi-scale mechanical analysis model of wood，both theoretically and empirically. Based on the hypothesis that wood is a kind of anisotropic material including cracks，analysis model of fracture mechanism for wood was established. The stress field and stress intensity factors of finite plates with cracks of edge type I were studied by the model. The effects of geometric features of cracks on the stress intensity factors were further analyzed when a wooden board was used to carry out a compact tension test. The formula for the stress intensity factors was established by dimensional analysis. The toughness factors of transverse fracture and fracture parallel to the grain of wood were further obtained by a model experiment. 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