Abstract: For the faults-caused operation failure in high-resistance grounding may exist, flexible DC distribution line protection is susceptible to be affected by line distributed capacitance currents, and noise interference may exist in flexible DC distribution line protection, we put forward a pilot protection scheme based on current-limiting reactance voltage. Firstly, the voltage polarity characteristics of current-limiting reactance on both sides of the line are analyzed, and the fault identification criterion is constructed by using Kendall correlation coefficient. Then, the ratio characteristics of low-frequency transient energy sum of bipole reactance voltage are extracted by variational mode decomposition (VMD) algorithm for fault pole selection. Finally, validation and analysis of simulation are carried out in PSCAD/EMTDC. The simulation results show that the scheme has strong ability to withstand transition resistance and noise interference, is not affected by the line distributed capacitance current, can act quickly and accurately under different fault conditions, has high sensitivity and reliability, and has certain applicability to the protection of four-terminal DC grid.