Abstract. The paper builds a planning model with maximizing the penetration of microgrid as its aim to realize the maximum output of microgrid based on the planning problem of microgrid grid-connection in distribution network. Considering the impact of microgrid grid-connection on distribution network, power flow, power balance, bus voltage are taken as the constraint conditions. Optimal scheme of microgrid grid-connection is acquired by the application of Artificial Bee Colony algorithm and the results of simulation calculation using IEEE 39-bus test system verify the validity of the built model and better convergence of the adopted algorithm.