The author first presents the purport of develops the monitoring and fault diagnosis system of hydroelectric set. In the second, the author analyzes the dominating fault, and the class of vibration and the characteristic of every kind.

• 本文首先叙述了开展水电机组的在线监测与故障诊断的意义，接着对水电机组的主要故障做了分析，分析了振动的种类和每种振动的振动特性，对各类振动的产生信号做了很深入的研究。