Thecapabilitytoperformfastload-followinghasbeenanimportantissueinthepowerindustry.Anoutputtrackingcontrolsystemofaboiler-turbineunitisdeveloped.Thesystemiscomposedofstableinversionandfeedbackcontroller.Thestableinversionisimplementedasafeedforwardcontrollertoimprovetheload-followingcapability,andthefeedbackcontrollerisutilizedtoguaranteethestabilityandrobustnessofthewholesystem.Loop-shapingH∞methodisusedtodesignthefeedbackcontrollerandthefinalcontrollerisreducedtoamultivariablePIform.Theoutputtrackingcontrolsystemtakesaccountofthemultivariable,nonlinearandcouplingbehaviorofboiler-turbinesystem,andthesimulationtestsshowthatthecontrolsystemworkswellandcanbewidelyapplied.