Aimed at the lines rebuilding and maintenance work in 10 kV distribution network, the vicious accident of “closing with grounding wire” may happen due to miss removing the temporary grounding wires after the work, a grounding wire detection method based on signal injection is studied. According to the features of distribution network, an electromagnetic transient simulation model, which is suitable for power station and transmission lines, is established to simulate the physical environment of temporary grounding wires during lines maintenance work. Combined with the PSCAD/EMTDC model, the rationality of proposed detection scheme is verified, and then the factors impacting the detection precision is simulated for analysis, which contain different signal frequency, transformer access, line branches, common-tower transmission lines and the earth resistance. Based on simulation analysis, a detection scheme based on current diversion principle is proposed, and its simulation condition is proved same with theoretic situation, which could effectively detect the three-phase, two-phase and single phase grounding situations, thus has a better practicability, and for 10 kV distribution network lines maintenance work, as well as a certain guiding significance. This work is supported by National Natural Science Foundation of China (No. 51177051 and No. 51477055) and the Science & Technology Project of China Southern Power Grid Company (No. K-GD2014-204).