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The flexible DC transmission technology is developing rapidly, but it faces more and more problems. A typical problem is that when a DC transmission line fails, its rapidly changing fault current will affect reliability. Therefore, how to cut off the fault current in the shortest time and ensure the safe operation of the power grid, it is particularly important to study the fast and reliable flexible direct current (FDC) protection mechanism that meets the requirements. In this paper, the research status of the protection mechanism of the FDC system is summarized and analyzed, and the characteristics of the fault are discussed. The new principle and new wiring method of the DC transmission line are innovated. An efficient DC line protection scheme that can meet various needs and ensure its normal operation is proposed. The simulation test and engineering application show that the scheme can quickly identify and isolate faults, which plays an important role in ensuring the safe and stable operation of the FDC system.