The flexural properties of Chinese larch（Larix gmelini） dimension lumber（40 mm×65 mm×4 000 mm,40 mm×90 mm×4 000 mm and 40 mm×140 mm×4 000 mm,Ⅰc and Ⅲc） were tested according to the American Society for Testing and Materials（ASTM） D4761-96 standard.The characteristic values for Modulus of elasticity（MOE） and modulus of rupture（MOR） were evaluated using both nonparametric and parametric statistical analyses.The preliminary results provide a reference for improving the existing Chinese structural dimension lumber testing and characteristic value evaluation system.The goal of this study was to improve the existing Chinese testing and evaluation system of dimension lumber.