The invention discloses an FCB set distribution method. The method comprises the following steps: obtaining an electrical network data file, and rejecting error data in the file; according to the file, searching for a largest electrical island, and determining a target electrical network; generating a topology structure diagram corresponding to the target electrical network; traversing various feasible FCB set distribution positions by use of a recurrence method, and solving optimal distribution positions respectively corresponding to various distribution numbers; respectively calculating economic indicators corresponding to the various optimal distribution positions; and determining a final FCB set distribution position, and performing distribution. In the method brought forward by the invention, the economic indicators are combined, and the characteristics of investment cost and economic benefits are taken into consideration so that the disadvantage of over high computational complexity is overcome, the robustness is high, and an FCB set optimal distribution scheme can be rapidly determined. The method can shorten calculating frequency and calculating time, and the obtained FCB set distribution scheme can simultaneously satisfy the requirements for economic benefits and safety.