In this paper, a metal-dielectric-metal nanoantenna array structure that supports multiple modes is designed. The mode properties and mediation for fluorescence emission of the proposed structure are analyzed. The transmission spectrum and electric field distribution of the proposed structure were simulated by the finite-difference time-domain method. Moreover, the mode properties of the localized surface plasmon mode and magnetic plasmon polaritons resonance mode, and the mode changes modulated by the excitation light polarization were analyzed. A dipole source was placed in the dielectric layer to simulate the luminescence process which the nanoantenna array structure regulating fluorescent molecule. The simulation results show that the radiation and non-radiation decay rate enhancement factors, quantum efficiency, and polarization characteristics of the fluorescence molecule are effectively modulated by the proposed structure. Besides, the emission spectrum can be tuned within a certain wavelength range by changing the polarization direction of excitation light.