Along with the steam turbine-driven IDF gradually applied in 1 000 MW turbine generator units, the related runback (RB) test has received more and more attention. Based on the analysis and summary of the debugging and RB test problems in a 1 000 MW turbine generator unit using steam turbine-driven IDF, this paper suggested the optimization strategy for the control logic of FDF and IDF. The RB test result proves the feasibility of the optimization strategy, which can provide reference for other units that use the steam turbine-driven IDF.