Surface plasmons¡]SPs¡^have been extensive applied to various kinds of detector and devices. There are very great relations of physical quantity, such as resonant angle, damping rate, halfwidth of resonance and reflection rate, etc. of resonating in the exciting of SPs. In this study, we derived some approximate formulas of these physical quantities from fresnel¡¦s formulas and pole approximate expansion, such as, the damping rate of SPs, the resonant angle, the optimum metallic thickness of these structure. In addition, we have also proceeding to some numerical simulations. Surface plasmons can also apply to near-field optics, using the super-resolution near-field structure¡]Super-RENS¡^ , the data densities can be promoted, and the diffraction limit can be overcome. SPs are excited at the Sb/SiN interface may concentrate light spot and enhance the field intensity. In this study, we have also expounded the fact that its antimony film in a Super-RENS of propagation, function and simulation of the SPs. As a result of calculations and simulations, we conclude that the enhanced filed intensity is larger for a system using a metal with a smaller imaginary part of the dielectric constant. The resonant angle decreases when the dielectric constant of the prism increases and the dielectric constant of the intermediate layer decreases. In addition, the optimum resonant condition in Super-RENS can be made by proper selection of parameters.