The effects of applied electromagnetic stimulation on discharge behaviors and pattern dynamics of a FitzHughNagumo (FHN) neuronal system are studied systematically.Firstly,under the action of strong nonlinear electromagnetic induction,the regulation of applied electromagnetic stimulation on FHN neurons shows a significant nonlinear variation,which not only induce the chaotic phenomena,but also give rise to the transition between different discharge modes.Secondly,the periodic oscillating electromagnetic stimulation can effectively regulate the spiking frequency and synchronization of NewmanWatts smallworld neuronal networks under electromagnetic induction,not only enhancing the detection and response ability to local weak excitation signals,but also effectively controlling the evolution of spatiotemporal patterns from phase synchronization to complete synchronization.This reveals the significant regulatory ability of applied electromagnetic stimulation on the dynamic behaviors of the neuronal system.The study could provide theoretical guidance for applying electromagnetic stimulation to treat certain mental diseases.