Through the analysis of the development trend of modern distribution system, it is pointed out that the smart micro-grid technology and flexible distribution system technology are an effective means to upgrade the distribution system technology. The operation mode, main application technology and operation control framework of intelligent micro-grid are summarized, and the development of the main technology in this field is analyzed. The concept of flexible distribution system is introduced, and the flexible distribution system in key power electronic equipment, technical route and its application field are discussed. The flexible distribution system technology to improve the existing distribution system operation mode is analyzed, and its application value is discussed.