Energy is an important material base for the survival and development of human society. It is closely related to the national economy and the people's livelihood and the national strategic competitiveness. At present, the world energy pattern is undergoing profound adjustment. The supply-demand relationship has been generally relaxed, and the tackling of climatic change have entered a new phase. A new round of energy revolution has flourished. China's economic development has entered a new normal state, the growth of energy consumption slowed down, the problems of the quality and efficiency of the development are acute, the structural reform of supply side is urgent, and energy transformation remains a daunting task.