Abstract: Aiming at the issues of further increase in both load peak-valley difference and line loss, as well as voltage over-limit in active distribution network, an optimal dispatching strategy for mobile energy storage in active distribution network is proposed based on global sensitivity analysis. Firstly, a global sensitivity analysis method considering overall voltage offset and line loss is proposed, aiming to address the four sensitivities of active power-voltage offset, active power-line loss, reactive power-voltage offset and reactive power-line loss. The candidate access location of mobile energy storage is determined by comprehensive sensitivity ranking. Subsequently, a two-stage optimal dispatching model for mobile energy storage is established. The first stage is to achieve the optimal effect of peak load shifting and the lowest operating cost of mobile energy storage. The second stage aims at minimizing the overall voltage offset, the line loss and the driving cost of mobile energy storage. Additionally, the range constraint of mobile energy storage access location selection is added to the second stage model. Finally, the IEEE 33 node distribution network system is taken as an example for simulation analysis. The results demonstrate that the proposed dispatching strategy can effectively reduce the overall voltage offset and line loss, while ensuring the good effect of peak load shaving and the economic operation of mobile energy storage as well.