Implementing the energy-saving and emission-reducing policy is one of the major measures to carry out the scientific outlook on development and strategic concept of building a harmonic society. It is also a must to realize sustainable development. By combining China's actual conditions and international experience in energy-saving and emission-reducing， a framework of the kernel theory and key technical support mechanism of energy-saving and emission-reducing in power industry is proposed. From the point of view of creating the long-term mechanism of energy-saving and emission-reducing and the joint strength composed of the market mechanism plus the sustainable development promoting policy mechanism， effective supervision and the technical support system for energy-saving and emission-reducing are proposed with emphasis placed on investigations of the market mechanism， policy mechanism and technical support mechanism in China's electric power energy-saving and emission-reducing.