Aiming at the problem that the transformer winding is difficult to detect the fault of the inter-turn short circuit, the method of using the voltage amplitude of the traveling wave reflected wave to locate the fault location is proposed. It inputs a low voltage pulse into winding wire end to obtain the traveling wave reflection signal and extracts the traveling wave reflected signal from the peak voltage amplitude, which is used as the electric quantity of the fault diagnosis. According to the change of the reflected voltage caused by the turn to turn short circuit, the fault location of the inter-turn short circuit fault is realized. The simulation result shows that the proposed method is simple and feasible. This work is supported by National Natural Science Foundation of China (No. 61173108 and No. 61472128) and Natural Science Foundation of Hunan Province (No. 14JJ2150).