For the continuous access of distributed power sources, the load demand of the distribution network is becoming more and more complex, and the problem of three-phase imbalance is becoming more and more prominent.In this paper, we will consider the load variation of multiple time periods and the maximum number of operations of the switch, it is proposed to build an optimization model with the goal of reducing the overall imbalance of the three-phase current at the exit side of the transformer and minimizing the number of switching operations, using an improved differential evolution algorithm, to improve the convergence speed and avoid the premature optimization process.The validity and accuracy of the proposed algorithm are verified by an example.The results show that the algorithm achieves deep optimization and can effectively solve the complex problem of multi-objective dynamic reconstruction.This research provides reference and reference for multi-objective reconstruction of distribution network with distributed power supply in China.