In order to quickly detect faulted phase in condition of voltage sags for distribution network, this paper proposes a faulted phase selection scheme using waveform characteristic of single-mode current. It uses a novel phase mode transformation matrix to achieve that mode 1 and 2 are not zero in all faulted types, and then taking mode 1 as reference, adopts waveform cross-correlation coefficient characteristics of three-phase current and its combined current and mode 1 current to achieve fault phase identification. PSCAD simulation results indicate that the proposed method is correct and effective, and can quickly and accurately identify faulted types under different fault conditions such as different fault locations, fault resistances and fault inception angles, which provides the basis of implementing phase voltage sag compensation. This work is supported by Doctoral Initial Fund of Xi’an Polytechnic University (No. BS1018) and Youth Academic Backbone Support Program of Xi’an Polytechnic University.