In this article surface plasmon resonance excited at nanohole arrays milled in metal films is studied by Comsol software. For investigation of SP resonance, the absorption spectrum combined with the electric field distribution is employed. Based on our results, it can be found that: 1) In the absorption spectrum, the SP resonance correlates with a resonant peak and all peaks in the spectrum do not correlate with the plasmon resonances 2) The size variation will shift the resonant wavelength 3) The maximum enhancement factor occurs at wavelength with the highest absorption peak.

Keywords: Enhancement Factor, Enhancement of Electric Field, nanohole, Surface Plasmon resonance.

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