Abstract: This paper measured MOE of a batch of SPF dimension lumbers by means of transient shock excitation method and applied Weibull distribution to fit the examination using 30 pine test pieces from totality second-class randomly. The result showed that MOE of pine testing lumbers of SPF batch followed the law of Weibull distribution and Weibull parameters determined by fitting examination, which had estimated the general mean value, standard deviation and probability of MOE at given values. The accuracy of assess was 95.9% according to code for design of timber structures(GB 5005—2003)and Weibull parameters, when pine test pieces of total second-class SPF dimension lumbers accorded with the standard of second-class, this mean was that the probability was 4.1% when pine test pieces of total SPF dimension lumbers were not up to the standard of second-class Ⅱ_c.