针对大型激光装置输出能量平衡能力，建立了束间均方根分析方法。构建了大型激光装置的光束能量观测数据变换过程，得到服从近似正态分布的变换数据，从而建立简便的束间能量平衡能力的均方根计算方法；基于全控图和选图，针对装置能量平衡能力短期变化提出均方差控制图，并定义装置平均失效强度函数，用于描述装置整体的能量平衡能力长期变化趋势。通过对调试数据的分析,验证了综合分析方法的可视性和高效性。

To account for output power balancing capability of large laser facilities, a synthetic method with beam to beam root-mean-square is presented. Firstly, a conversion process for the facilities from original data of beam powers to regular data is given. The regular data contribute to the normal distribution approximately, and then a corresponding simple method of root-mean-square for beam to beam power balancing capability is given. Secondly, based on theory of total control charts and cause-selecting control charts, control charts with root-mean-square are established which show short-term variety of power balancing capability of the facilities. Mean rate of failure occurrence is also defined and used to describe long-term trend of global balancing capabilities of the facilities. Finally, advantages of the intuitive and efficient diagnosis for synthetic methods are illustrated by analysis of experimental data.