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The distributed power flow controller (DPFC) realizes large-scale power flow control through the series connection of sub-modules. The larger the DPFC capacity and the level of sub-modules connected to the system, the greater the impact that may be caused. Starting from the DPFC structure and operating principles, the paper proposes graded start strategy of DPFC based on the world’s first 220kV DPFC demonstration project. The strategy coordinates each sub-module to start step by step and unlock under lower DC voltage through the centralized control system, reduces system power fluctuation, and reduces the overall start-up time through the information interaction between the centralized control and the multi-series valve control systems in sub-modules. The test results of the HUZHOU DPFC demonstration project show that the strategy proposed can reduce the active power fluctuation amplitude of the 4 sub-modules DPFC by 75% which have good prospect of engineering application.