目前低应变动测确定单桩承载力是根据线性振动理论测得桩土体系抗压刚度（习称桩的动刚度），通过经验公式计算单桩承载力。由于其理论的不成熟及检测实际中的影响因素较多，难以客观反映实际的桩土特性，常给建筑工程造成隐患，甚至影响建筑物的正常使用。 At present, low-strain dynamic test to determine the single-pile bearing capacity is based on the linear vibration theory to measure the pile-soil system compressive rigidity (learning said pile dynamic stiffness), through the empirical formula to calculate the single pile bearing capacity. Due to the immaturity of its theory and the fact that there are many influencing factors in actual testing, it is difficult to objectively reflect the actual characteristics of pile and soil, which often creates hidden dangers for construction projects and even affects the normal use of buildings.