Abstract: Aiming at the optimization and reconstruction of the distribution network, a multi-objective optimization and reconstruction model of the distribution network is established with minimizing the active network loss, minimizing the voltage offset degree and minimizing the load balance degree as the objective functions. A multi-strategy hybrid improved fireworks algorithm（IMFWA） is proposed. The non-repetitive loop coding is adopted to compress the solution space and improve the search efficiency. Sobol sequence is used to generate initial population to enhance the diversity and traversal of population. The optimized fireworks and random fireworks for displacement operation are used to maintain population diversity. The mixed mutation method of Gauss and Cauchy are used to improve the efficiency of optimization. The optimal solution set is arranged and selected by using the Pareto dominance relation and the comprehensive index composed of the fitness and crowding functions to improve the convergence speed. Simulation experiments are carried out on the IEEE-33 node system. It is verified that the proposed method is effective and feasible. The experimental results show that the optimized reconfiguration scheme can effectively improve the operation index of the distribution network, and according to different actual situations to provide the power grid personnel with the reconstruction plan.