简要介绍了某水电站内部观测自动化监测系统，重点介绍了系统所采用的整体屏蔽、交流电源防雷、通信线路防雷、传感器线路防雷等各项防雷措施。在应用中对发生的数次雷击事件进行了仔细分析，查找出雷击造成设备损坏的原因，并针对其提出了改进措施，提高了监测系统的防雷能力，取得了良好的效果。

This paper introduces the automatic monitoring system on inner observation of a hydropower station， especially describes lightning ?proof measures that have been used in the system. Several lightning strokes to ok place in August, 2007. By means of analysis, it is concluded that the causation is lightning stroke to be led into inner of equipments through the shield-lines of the sensors so as to damage equipments. Some measures to improve the lightning proof capability of the automatic monitoring system were taken, and they are in perfect order at present.