基桩动测系统中由于传感器在桩顶的耦合而改变了原系统的动态模型 ,从而使系统的动态响应也发生变化。文章对基桩动测中常见的几种耦合剂对系统频响特性影响情况作了理论分析和实验验证 ,指出了进行基桩动测时耦合剂缩小传感器工作频率范围的作用与影响 The dynamic response of the system changes due to the change of the dynamic model of the original system due to the coupling of the sensor at the top of the pile in the dynamic measurement system of pile foundation. In this paper, theoretical analysis and experimental verification of the effects of several coupling agents on the frequency response characteristics of the system, which are common in the dynamic measurement of piles, are presented. The role and influence of the coupling agent in reducing the working frequency range of the sensor during pile foundation dynamic measurement are pointed out