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The fixed frequency operation of fans in the loop-controlled ventilation system of subway stations leads to the inability of fans to follow the change of PM2.5 concentration on the station platform and change the frequency, resulting in energy waste. According to the operation status of the loop-controlled ventilation system, it can be divided into the mode of sending only without exhausting, the mode of not sending only exhausting and the mode of sending and exhausting, and considering that the loop-controlled ventilation system should adapt to the influence of multiple disturbances, the least-squares system is selected to identify the first-order plus time delay model for describing the variable dynamic change response transfer function, and the control model of the loop-controlled ventilation system is established by using a active disturbances rejection controller, and the harmony search algorithm is used to The results show that after optimization, the average PM2.5 concentrations on the station platform are reduced by 7%, 8% and 10% in the sending-only mode, the non-sending-only mode and the sending-and-exhausting mode, respectively, and the fan energy consumption is reduced by 19%, 19% and 30%, respectively.