According to the technical requirement of traveling-wave fault location and characteristic of CVT for transmitting high frequency signal， by simulation， the feasibility of fault location by use of the secondary signal of CVT is analyzed. Considering a practical project， some practical issues such as self-adapt threshold to eliminate noises， synthetically judging by different voltage， dealing with the fault data in sampling and so on are addressed to improve the reliability and veracity in distinguishing the traveling-wave. In the paper， the principle and thought of these practical methods are discussed. Finally， results of simulation and field test are presented and show that the fault location based on the secondary signal of CVT is feasible.