对高速加工中心的故障信息进行分析,由故障数据拟合出故障间隔时间的概率密度函数和经验分布函数,假设服从威布尔分布,然后运用最小二乘法和一元线性回归方法计算分布模型的参数。建立可靠性统计计算模型,进行线性相关性检验,得出高速加工中心的故障间隔时间服从威布尔分布,并确定故障间隔时间概率密度函数和分布函数,最后求出可靠性指标MTBF。 The fault information of high speed machining center is analyzed. The probability density function and empirical distribution function of failure time are fitted out from the fault data. Suppose obeying Weibull distribution, and then calculating the parameters of distribution model by least square method and univariate linear regression method. The statistical model of reliability was established and linear correlation test was carried out. It was concluded that the failure interval of high-speed machining center obey Weibull distribution, and the probability density function and distribution function of failure interval time were determined. Finally, the reliability index MTBF was obtained.