Abstract: Aiming at the problem of safe and stable operation of a large number of microgrids in intelligent distribution system, a multi-microgrid intelligent distribution network optimization coordination model based on twolayer optimization strategy is proposed. At the bottom layer, an optimization model is constructed to minimize the total operating cost of the multi-microgrid system, including the generation cost, the environment cost and the power exchange cost between the multi-microgrid system and the distribution network. Combined with operation cost and net load peak-valley difference, the optimization model of upper intelligent distribution system is constructed. The two-layer model is transformed into second-order cone programming and mixed integer linear programming by second-order cone relaxation method and linearization method. Finally, the Cplex solver is called by MATLAB to solve the model. The standard IEEE 33-node distribution system is seleeted as an example for simulation verification. The results show that the model not only reduces the operating cost of intelligent distribution system and multi-microgrid system, but also reduces the load fluctuation of intelligent distribution system and improves the power quality of intelligent distribution system.