In this study, we have investigated the relationship between the ferromagnetic resonance (FMR) and the microwave – assisted magnetization switching (MAS) effect by using a same single Co/Pt multilayer nanodot based on the anomalous Hall effect (AHE) detection technique. The FMR peaks of the Co/Pt single nanodot can be clearly detected. These FMR peaks are probably attributed to the second-order concentric spin-wave mode. Two clear dips of the switching field Hsw observed.