Abstract: The emphasis of this study is laid on designing a reheat-starting transient control subsystem of an aeroengine,after the main fuel control system of the engine has been designed.That is to say,the study pursued to the reheat-starting transient control method,which can coordinate the changes of the reheat fuel supply and the nozzle area,so the reheat-starting transient process does not affect the regimes of the core engine as possible,so that the engine can work safely and steadily.The optimal control method is employed with success.