Abstract: When a DC line fault occurs in a high-voltage DC transmission system, a phase-shifting restart strategy is used to quickly suppress the fault current by controlling the rectifier's phase shift, and after going through the deionization time, the phase shift is released and the high-voltage DC transmission system is restarted. However, when phase-shifting restarts, both rectifiers and inverters no longer consume reactive power, and the AC filter of the converter station will provide surplus reactive power to the AC system, which is prone to producing overvoltage of the AC system; for the symmetrical single-pole topology, it will also affect the non-faulted line that cannot transmit active power, which will produce a large active power impact on the AC system. This paper proposes a DC line fault ride-through restart strategy. In the event of a DC line fault, by controlling the rectifier and the inverter at both ends of the fault with equal dc currents, the DC current will ride through the fault while controlling the current at the point of fault to be zero, and the reactive power consumption will continue to be maintained to avoid the generation of an overvoltage in the AC system.. For the symmetrical single-pole topology, the fault-pole continuation of the current can also be utilized to continue to deliver part of the active power.