In recent years, as island development becoming ahotspot, a number of problems in the construction of island microgrids are emerging. Firstly, the existing microgrid classification and existing problems are introduced. Secondly, the development status and key technologies of energy and information technology are analyzed. Finally, two types of islands named on grid and off grid are used as examples to explain the sea island microgrids construction in Lianyungang based on advanced energy and information, and provide a model reference for the construction of island energy Internet.