Abstract: Phase and line selection are the keys to effectively controlling single phase-to-ground faults in distribution networks. The existing methods need more ability and better adaptability to identify the high-resistance grounding fault (HGF). To solve this problem, this paper presents an active phase selection and line selection method for the HGF distribution network. Firstly, the variation rule and response mechanism of zero-sequence voltage characteristic components are analyzed before and after a single phase-to-ground fault. Secondly, an active phase selection method based on bus CCV-PV is constructed by comparing the characteristics of the current variation principle value (CCV-PV) of the healthy phase and the faulty phase. Thirdly, an active line selection method based on lines CCV-PV is constructed by comparing the CCV-PV characteristics of healthy and faulty feeder lines. Theoretical analysis and simulation results show that the proposed method can be realized only by injecting characteristic current through an active arc suppression device (AASD). Furthermore, the proposed method has high sensitivity in complex operating conditions such as HGF, three-phase zero-sequence asymmetry, and asynchronous sampling.