Abstract: In the light of the poor convergence of single objective algorithm,Harris Hawk algorithm based on adaptive grid is proposed for the multi-objective reactive power optimization of distribution network with multi-energy router（MER）. Tent chaotic mapping is introduced to generate uniform individuals in the initialization population stage to enhance the diversity of the population,comprehensively considers the density information of Harris Hawks individuals in the selection of optimal individual and trimming of non-inferior solution sets,as well as balances the global and local search capabilities. Then,reactive distribution network optimization model is established with the objective function of minimizing active network loss and voltage deviation. The modified IEEE-33standard test system is used as an example for simulation analysis. The simulation results show that compared with NSGA-II and MOPSO,the proposed algorithm has better convergence and better performances in two aspects of active network loss and voltage deviation.