Abstract: Combined with problems encountered in practice, the paper discussed the calculation method of MTBF, one of the reliability assessment indexes of automatic monitoring system, and further more advanced the suggestion that the MTTR and assessment units weight should be added into the reliability assessment of automatic monitoring system.

摘要： 结合工程实践中遇到的问题, 对监测自动化系统可靠性考核指标之一平均无故障工作时间(MTBF) 的计算方法进行探讨, 提出了对监测自动化系统可靠性考核宜增加平均维修时间(MTTR) 指标和考核单元权重系数建议。