对电缆故障定位中常用的相关分析方法进行了模拟试验和误差分析 ,介绍了在数字信号处理领域应用广泛的小波变换的基本算法 ,引入基于离散小波变换的滤波器对测试数据进行处理 ,自行研制的定位仪样机试验结果表明 :小波变换的方法可取得较高的故障定位精度 The commonly used correlation analysis methods in cable fault location are simulated and the error analysis is introduced. The basic algorithms of wavelet transform widely used in digital signal processing are introduced. The filter based on discrete wavelet transform is introduced to process the test data, The experimental results of the prototype of the locator show that the method of wavelet transform can obtain high fault location accuracy