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Recently,the Floquet states of matter of quantum systems under periodic driving has attracted much attention,which opens a new door to artificially synthesize exotic quantum states of matter,especially the ones absent in static systems,by periodic driving.However,it is still an open question that how to detect these novel Floquet states of matter in such time-dependent systems.Based on Floquet theorem and going beyond the rotating-wave approximation,we establish the microscopic description to the resonance fluorescence of a twolevel system under ultra-strong laser driving.