Abstract: In view of problem that single line selection method of resonant grounding system prones to misjudgment and is easily affected by the training samples, new line selection method of resonant grounding system based on energy and correlation was proposed. Firstly, current mutation of each phase and comprehensive correlation coefficient of each line are calculated;then EMD algorithm is used to calculate weight coefficient of intrinsic mode energy corresponding to phase current mutation of each line, and the maximum value of weight coefficient of intrinsic mode energy of three phases in each line is taken as the comprehensive energy coefficient value of the line;finally,feature distance of each line is obtained according to the two-dimensional criterion.The simulation results show that the new line selection method of resonant grounding system based on energy and correlation achieves bus fault diagnosis, improves criterion margin in a certain extent, and has wide scope of application.