This article research that how the single-factor variable affect the MOR and thickness swelling rate of the particle board via orthogonal experiments. The optimum condition of the maximum MOR value is 20% resin content, 120℃ hot pressing temperatures, 10 minutes hot pressing time and the proportion of Robiniapseudoacacia/ wastepaper(w/w) is 1/1. Under this situation the MOR of composite particle board is 15.4MPa and the thickness swelling rate is 16.37%. The order of the factors from majority to minority influence is resin content > proportion of Robiniapseudoacacia/ wastepaper (w/w) > hot pressing time> hot pressing temperatures. <br /><strong>Key words:</strong> Robiniapseudoacacia; Wastepaper; Orthogonal Experiments; MOR