Abstract: To analyze the resonance characteristics of DC distribution, firstly, a Norton equivalent circuit model of grid-connected converter, AC load interface converter and DC load interface bidirectional DC-DC were built based on the harmonic analysis model with dynamic phasor sequence components（DPSCs）, respectively. Thus, the equivalent circuit model of DC distribution network was obtained. Secondly,based on the equivalent circuit model, the system node impedance was formed. Then, by analyzing the frequency characteristics of each element in the node impedance matrix,the resonance characteristics of the entire DC distribution network were obtained, including the harmonic interaction between different converter and the harmonic interaction of converter itself. Thirdly, the main factors affecting the resonance characteristics of DC distribution were deeply studied. Finally, the correctness and validity of the theoretical analysis were verified by simulation.