The invention relates to a circuit topological structure of a direct current distribution and utilization system. The direct current distribution and utilization system includes a medium-voltage direct current distribution subsystem and a low-voltage direct current distribution subsystem, wherein the input terminal of the medium-voltage direct current distribution subsystem is used for accessing ahigh-voltage alternating current system; the direct current bus of the medium-voltage direct current distribution subsystem and the direct current bus of the low-voltage direct current distribution subsystem are electrically communicated through an electrical converter; and the input terminal of the low-voltage direct current distribution subsystem is used for accessing a new energy power generation device, an energy storage device, an electric vehicle and a direct current load. The direct current distribution and utilization system uses the electrical converter to connect the medium-voltagedirect current distribution subsystem with the low-voltage direct current distribution subsystem, thus reducing the conversion link so as to enable control of the power distribution network to be simpler, at the same time can support flexible switching of multiple-direction flows, can provide a fault isolation function for the alternating current and direct current systems, and can provide flexible active and reactive power support for the alternating current system. Therefore, the direct current distribution and utilization system can realize flexible regulation of the flow direction in the electric power system, and can support flexible interaction of source, network, charge and storage.