Abstract: In deformation monitoring, mean square error is the standard for accuracy.To obtain deformation rule and to monitor dam safety situation, requirements for monitoring accuracy should be advanced and be different between high dams and low dams.Oscillating dam body is not suitable for distribution of basic working points, because their displacement is measured by inverted plumb line whose measurement accuracy would exert influence on the accuracy of whole system.

Key words: monitoring accuracy, monitoring indexes, high and low dam, basic working point

摘要： 变形监测采用中误差作为衡量精度的标准，为满足测得大坝变形规律、监控大坝安全的要求，还应提出对历次监测成果精度估计的要求。对高、低坝应有不同的精度要求。监测工作基点不宜布设在变动的坝体上，因工作基点位移值主要是用倒垂测得的，其监测精度影响整个系统精度。

关键词: 监测精度, 监控指标, 高低坝, 工作基点