At present, it has become an inevitable trend to upgrade the power grid to the Energy Internet, and more and more market players will join the Energy Internet. In this case, building an Energy Internet ecosystem with the characteristics of win-win sharing is a key issue that determines the construction of the Energy Internet. In this article, firstly, the concept, connotation and characteristics, especially the business system of the Energy Internet, are systematically sorted out. Then, on this basis, based on the ecological circle theory, the theoretical model of the Energy Internet is constructed, and various elements of the Energy Internet ecosphere are designed. Finally, combined with the development trend of the Energy Internet business, the key points for the construction of the Energy Internet ecosystem are given.