In order to effectively improve the situation of dispatchers using the "Pull Line" method for line selection, the SCADA system of all levels of dispatching agencies is used to obtain the steady zero-sequence current of the line, and a small current grounding line selection method based on the dispatching SCADA system is proposed. The new line selection method can be applied to small current systems where the neutral point is not grounded and the neutral point is grounded via the arc suppression coil. By comparing the steady zero-sequence current amplitude and variation, the fault line can be confirmed by up to 1 pull operation. Up to now, 19 substations in Wuhan Power Grid have begun to apply new line selection methods for line selection, and all the 14 single-phase ground faults have been judged correctly. The actual line selection case and application process show that the method is accurate and effective, which could be widely applied and promoted. This work is supported by National Natural Science Foundation of China (No. 51277135).