The velocity distribution profiles of annular synthetic jet were identified by experimental method and the optimum heat dissipation distance was obtained by parametric study. By combining it with LED headlamp, the heat dissipation effect of the synthetic jet on LED headlamp was confirmed by the experimental method. Based on large eddy simulation, the flow field and temperature field of the component were solved, and the distribution of temperature and heat transfer coefficient was clarified while verifying the validity of the simulation method. POD method was used to analyze the flow field and convective heat transfer coefficient on the surface of aluminum substrate. The results indicated that the distribution characteristics of convective heat transfer coefficient and thermal control effect of synthetic jet are mainly determined by the large-scale eddy of the flow field.