Civilian power system has many branch lines which lead to the refraction and reflection of the fault traveling wave are very complicated, and the reflected traveling wave signal is weak and it is hard to capture and recognize the signal. In order to locate the fault, this paper presented a method which utilize branch line detection device+host receiver+low voltage pulse generator. The branch line detection device can detect the branch lines and send the fault message to the host receiver, and then the host receiver will display the fault message in the computer screen. The low voltage pulse generator is used to add a pulse signal to the lines after power off to resurvey and improve the accuracy. These devices can be worked cooperatively with the general traveling wave fault location equipment to realize the accurate fault location of civil power line.