Abstract: Energy efficiencies in China are analyzed based on the super-efficiency DEA, and the result shows that energy efficiencies in China have a down-up-down-up wavy-like change process since reform and open policy, and it will continue to improve in the near future. According to a logical relation analysis on influencing factors for the energy efficiency, technical progress and structure adjustment are determined as key influencing factors of energy efficiency, on basis of which, an econometric analysis between energy efficiencies in China and technical progress, structure adjustment since reform and open policy is conducted. The effects of patent authorization quantity, percentage of output value of tertiary industry in GDP, natural gas consumption proportion in energy consumption structure, and hydropower consumption proportion in energy consumption structure imposed on the energy efficiencies in China are empirically investigated, and improvement countermeasures of energy efficiencies in China are put forward.