This paper presents a new fault location method using high-frequency transient voltages generated by ground faults on transmission system. The method is based on the measurement from one end of the transmission line. The fault location is determined solely from the arrival time of initial waves of modal voltages at the measuring bus. The method does not need to exploit the reflected waves. The method is tested quantitatively using the Alternative Transients Program/Electromagnetic Transient Program (ATP/EMTP) for typical ground faults on a model of transmission line. The statistical results are given to demonstrate the performance of the proposed method.