Abstract: Aiming at the problems such as the complex topology structure and many branches of the distribution network lead to the `rising cost of the current traveling wave fault location, the configuration scheme of the traveling wave fault location device on the branch line in the distribution network is changed, and the double-end-line zero-mode wave velocity difference fault location method is proposed for the branch without the configuration of the fault location device to realize the full coverage of the single-phase fault location. The distribution network model is constructed by using physical circuit components. In the simulation experiment of single-phase fault, the high-speed data acquisition card is used to extract the waveform of the modulus traveling wave and calculate the modulus traveling wave velocity, which is further in line with the actual production. The test and calculation results show that this method has high ranging accuracy and strong stability, which significantly reduces the fault location cost and has practical significance.