In order to achieve grid connected optimal dispatch of micro-grid, a improvedbee colony method is put forward to carry out optimization of grid connecteddispatch. Firstly, the optimal scheduling model of micro-grid grid connection,and the overall cost of generating electricity and environmental cost of micro-grid grid connection is used as objective function, and system power balanceconstraint, power constraint of micro power supply, contact line constraintthat interacted with main grid and charge and discharge cycle of batteryare used as constraint conditions. Secondly, the improved bee colony algo-rithm is established through introducing particle swarm algorithm. Finally,a residential area is used as an example, and the optimal dispatch ofmicro-grid grid connection is carried out based on proposed model, andsimulation results showed that the proposed model has higher correctness andefficiency.