The Lightning parameters inversion research is importantly meaningful to take measures to protect electrical devices from lightning efficiently. The distribution with different lightning fault types are quite different. It is necessary to study on current distribution with direct lightning strike faults, which occurs more often. In this paper, 110kV transmission line is taken as the research object. Firstly, the novel contactless lightning current monitoring system based on differential-integral loop is briefly introduced, which is to state the aim to focus on lightning current on the phase wires. Secondly, combining with the field data of 110kV transmission line, the transmission line model built by EMTP-ATP software is established. Finally, the lightning current distribution coefficient variation trends are acquired by simulation models with different lightning sources under different direct lightning strike fault types. The results show that the distribution coefficient variation trends of shielding failure with flashover are almost the same, while they are quite different with back flashover type. Therefore, it needs to choose the appropriate distribution coefficient respecting to different fault types when doing lightning parameters inversion research.