Abstract: In recent years,frequent extreme disasters have challenged the stable operation of the power system. This paper integrates the large-scale ship micro-grid system into the distribution network to improve the flexibility and reliability of the distribution network in coastal areas or islands, and proposes a strategy to improve the flexibility of the distribution network considering the ship micro-grid system. First,a multiobjective optimization model that minimizes the total operating cost of the ship microgrid system and the distribution network while maximizing the flexibility of the distribution network is established;second,for different systems,the constraints of the ship microgrid system and the distribution network system are constructed. Finally,in order to overcome the complexity and nonlinearity of the model solution,the Collective Decision Optimization Algorithm（CDOA） is used to solve the proposed model. The simulation results show that under normal conditions, the coordinated dispatch of the mobile ship microgrid system can improve the reliability of the network,while in the event of an extreme disaster,the reasonable dispatch of the ship micro-grid system can significantly improve the resilience of the distribution network and compensate much electricity for the post-disaster conditions.