The development in the technologies of new energy generation and microgrid operation has made economical and environment-friendly electric power available to users far away from the main grid.Inspired by the interconnection of main grids able to effectively improve system security and supply reliability，an operation strategy of interconnected microgrids from multiple islands is proposed.Based on the predicted generation and load，a stochastic dispatch model of microgrids from multiple islands is developed to optimize the security and economy of the interconnected system.The model is solved by the Monte Carlo simulation based particle swarm optimization（MCS-PSO）method.In order to improve the dispatching accuracy，optimization is performed periodically for dynamic updated data.The case studies of interconnected microgrids from three islands have verified the effectiveness and rationality of the dispatching strategy proposed.