Abstract: In the future, the configuration of medium and low voltage distribution network will be multi-dimensional ring network composed of multiple voltage levels, AC-DC network coupling interconnection, with unified standard coupling interconnection application ports, and flexible AC-DC hoc network frame mode based on high-level network or system theory. Flexible DC interconnection system of multi-energy complementary distribution network is the basic support link for construction and application of new power system, energy Internet and intelligent distribution network in the future. The medium and low voltage distribution network represented by flexible DC technology and AC-DC flexible coupling interconnection technology will also be one of the development directions in the future. From the perspective of engineering construction and application, DC flexible interconnection system of multi-energy complementary distribution network from two aspects of construction and design scheme are introduced. Based on the significance of the construction of DC flexible interconnection system in the multi-energy complementary distribution network, the construction objectives of DC flexible interconnection system in the station are analyzed, and the construction contents of DC flexible interconnection system in the station are summarized. Furthermore, the design scheme of DC flexible interconnection system from four aspects: system topology structure, system scheme characteristics, system protection configuration and system operation control strategy are analyzed. Finally, the construction and design scheme of DC flexible interconnection in the distribution area are summarized and prospected. It can be expected that the development of DC flexible interconnection technology in distribution network area is bound to bring new paths and means for technological innovation and comprehensive benefit improvement, and provide effective technical guarantee for development and application of medium and low voltage intelligent distribution network technology.