For the examination of the relationship between the bending strength and the degree of termite attacks, Western Hemlock (Tsuga heterophylla Sarg.) was used. Sixty specimens (4.5 x 4.5 x 82 cm³) were attacked by termites at the culture room of Coptotermes formosanus Shiraki. The termites were introduced on the central parts (10 cm) of specimens. In the case of the 2 points loading, the bending moment is maximum at these parts. According to the results obtained from this experiment, both the modulus of rupture (MOR) and the modulus of elasticity (MOE) were showed significant against the weight loss (WL) of central parts of the specimens. MOR = 713 - 19.9 WL (n=60, r=-0.73**) MOE = 127800 - 1910 WL (n=60, r=-0.58**)

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