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。

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.