Abstract: This paper, in terms of the data (1980-1983) of the four large forest areas: Da Xing-an Ling, xiao Xing-an Ling, Zhang Gangcai Ling and Chang Baishan, draws the following conclusions by the statistical results of random sampling of logs on the longitudinal, sorting conveyor:1. The current distribution law of the linear load on the sorting, longitudinal conveyor at log yards is "The Curve Distribution of K. Pearson Ⅲ"2. If given the confidence probability which is 90%,the credible ranges of linear load on the sorting, longitudinal conveyor of the four large forest areas are following respeetively: Da Xing-an Ling: q=0.0031—0.072z; Xiao Xing-an Liny:q=0.0040—0.1369; ghang Guany-cai Ling: q=0.0043—0.1739; Chang Bai—shan: q=0.0031—0.1338.