This study first considers the dynamic development process of the UEI and proposes an evaluation index system for the maturity of UEI development that includes three dimensions of development status, development benefits and development prospects. Energy Internet is the comprehensive use of advanced power electronics technology, information technology and intelligent management technology to interconnect a large number of distributed energy harvesting devices, distributed energy storage devices and new power networks, oil networks, natural. Considering the process of energy development and utilization and based on the development objectives of low carbon, high efficiency and electrification, this paper selects key indicators from three aspects, i., energy supply, energy consumption and energy trading.