The minimum square method was used in regressing analysis for the result of treatment in a supposed distribution function , the " d " examination method was used for weibull distribution and index distribution , and obtained the distribution type in the life of the main shaft bearings , appraised the reliability life , the mean life and the reliability in 500hours of the main shaft bearings with theoretical distribution function 用残存比率法、平均故障法和累积故障法对主轴轴承可靠寿命进行了评估，用最小二乘法对现场数据统计处理结果进行了假设分布的回归分析，并用d检验法对威布尔分布和指数分布进行了分布检验，得出主轴轴承寿命分布类型。利用理论分布函数，对主轴轴承可靠寿命、平均寿命、 500小时的可靠度进行了评估。
The variable parameter taper equation was built with diameter determination datas of different parts of cryptomeria fortunei plantation sample wood , in combination with the relative tree height curve mode and other assistant equations , volume table of c . fortunei plantation standing was compiled , and provided the scientific basis for the production and application 摘要利用柳杉人工林样木各部位直径测定数据，建立可变参数削度方程，配合威布尔分布函数、相对树高曲线模型及其他辅助方程，编制了柳杉人工林林分出材率表，为生产应用提供科学依据。
