工程中用小应变法测量基桩的完整性时，由于桩土参数的复杂性，常常使不同缺陷类型桩的检测信号波形呈现相似的特征。综合分析信号特征，是防止误判的有效方法。文章通过现场工程测试，给出了判断是扩－缩桩还是断桩的典型分析实例，可以为桩完整性检测提供参考。 When measuring the integrity of piles using the small strain method in the project, due to the complexity of the pile-soil parameters, the detection signal waveforms of different defect types often exhibit similar characteristics. Comprehensive analysis of signal characteristics is an effective method to prevent misjudgment. The article through the on-site engineering test, given the judgment of the expansion-contraction pile or break the typical analysis examples, can provide a reference for the integrity of the pile detection.