Abstract: The 500 kV double circuits transmission lines on the same tower have high induced voltage and current due to the small spacing and the short distance, which will directly affect the line maintenance, operation and selection of grounding switch equipment when a circuit is overhauled and the other line is running normally. In this paper, based on one 500 kV double circuits transmission lines in operation in North China, we use EMTP-ATP electromagetic transient simulation software to build the model of double circuit transmission lines on the same tower and then analyze the effects of horizontal spacing between transmission lines, length of the running line, power flow of the line, height of the grounding wire and soil resistivity on the induced voltage and current on the maintence line.And, we also analyze the effects of size of the ground resistance and the grounding mode on the induced voltage and current on the maintence line.The results show that the horizontal spacing between transmission lines, length of the running line, power flow of the line, height of the grounding wire have great influence on the electrostatic and electromagnetic induction components, but the influence of the soil resistivity on the induced voltage and induced current can be ignored.Moreover, under different grounding modes, the induced voltage and current of the overhauled line have obvious changes.The simulation results can provide significance for safety measure formulation when design or maintenance the same tower line.