针对大型复杂系统故障诊断中的权重变化问题 ,提出和定义了变权重模糊综合评判模型 ;在模糊综合评判过程中 ,各评判因素对于不同评判等级具有不同权重的问题在新模型中得到恰当的描述 ,从而使大型复杂系统故障诊断的精度得到实质性的提高。故障诊断实例表明 ,变权重模糊综合评判模型对于解决实际问题是有效的 ,其结果明显优于采用传统固定权重模型的结果 Aiming at the problem of weight change in large-scale complex system fault diagnosis, a variable weight fuzzy comprehensive evaluation model is proposed and defined. In the process of fuzzy comprehensive evaluation, the problem that each evaluation factor has different weights for different evaluation levels is properly described in the new model , So that the accuracy of fault diagnosis of large and complex systems has been substantially improved. The example of fault diagnosis shows that the variable weight fuzzy comprehensive evaluation model is effective in solving practical problems and the result is obviously better than that of the traditional fixed weight model