To improve the accuracy and sensitivity of distribution network fault phase selection, a method based on the calculated deflection angle is proposed for a high resistance ground fault and a single phase line fault. First, the reasons for phase selection failure for high resistance grounding and a disconnection fault are analyzed. Then, from the measured parameters to the ground the occurrence of a high resistance or line fault is determined. Finally, a phase selection method based on flexible zero sequence voltage regulation is proposed, that is, zero sequence current is injected into the neutral point of the distribution network, the phase angle of zero sequence voltage is adjusted to be the phase angle of three-phase voltage of the distribution network, and the fault deflection angle is calculated by injecting zero sequence current and zero sequence voltage return. The fault phase selection can be realized by combining the criteria. PSCAD simulation results show that this method can quickly and accurately select 20 kΩ single-phase high-resistance grounding fault phase and line end disconnection fault phase without being affected by fault location, fault type and neutral grounding mode of the distribution network. This work is supported by the National Natural Science Foundation of China (No. 51737002 and No. 52037001).