Abstract: The dynamic modulus of elasticity (MOE) of wood-plastic structural planks was measured nondestructively by the longitudinal transmission, longitudinal vibration, and flexural vibration test. Three point bending test was used to measured the static MOE and maximum bending force (F_m). The maximum bending force of same wood plastic structural planks was predicted by the regression formulas between dynamic MOE and F_m, and the First-Order Second-Moment method (FOSM) was used to analyze reliability index based on measured and predicted F_m. The results indicate that there is a significant correlation between dynamic MOE and F_m. The reliabilities of the wood-plastic structural planks based on predicted F_m are slightly greater than that based on measured F_m, in which the biggest difference is 0.66%.