Abstract: Double-metal marks are widely used in monitoring of dam vertical displacement. The paper introduced the double-metal marks in aspects such as the working principles, selection of material and parameters, structure, installation, monitoring and calculation. Further, some issues call for attention were analyzed and discussed.

摘要： 双金属标是大坝垂直位移监测中一种重要的测量装置。从工作原理、管材的选择和参数测定、结构型式、安装埋设、观测与计算等几个方面，分析和探讨了双金属标应用中应注意的几个问题。