This paper proposes a hierarchical structure of the island micro grid communication network based on analyzing business requirements of island of micro power grid protection and control management system, and researching intelligent substation, intelligent distribution network, and grid-connected type micro power grid communication architecture scheme. Hierarchical structure of the island of micro power grid communication network is composed of three-level communications network, which is the "up" to the master station communication network, two-layer communication network in micro power grid, and the "down" to link with power distribution network. Taking the first megawatt demonstration project — Nanji island micro power grid as an example, this paper introduces the island micro grid system structure and the protection control and management system, gives the hierarchical structure of island micro grid communication network architecture, composition, and configuration principle, and introduces the engineering application instances.