For the stability problems existing in DC distributed distribution system, this paper analyzes the influence of different factors on the stability of DC distributed system. Based on the typical DC distribution system with multiple source converters, through the small signal modeling method, the influence of line impedance, the type of source DC converter and control parameters on the system stability, especially for multiple resonance peaks, is analyzed, the resonance frequency and resonance peak that cause the system instability are calculated, and the influence of converter type and control parameters of DC distributed system on the system stability is analyzed. It provides a theoretical basis for the stability analysis and stability improvement of DC distributed distribution system. Finally, the experimental results verify the correctness and effectiveness of the theoretical analysis.