In this thesis we capsule the development and the basic theory of surface palsmon. In the experiment, we design and fabricate sub-wavelength periodic structures onto the InGaN light emitters and record the spectra of InGaN with different structures. In our result, we are sure of the exist of surface plasmon, and we also see that both the increase and the decrease of the light extraction can be found in the experiment. From the result, we can know that the effect of surface plasmon on light emitters depends on the parameters of the added structures, and if the structures can be well designed, we will have a chance to improve the light extraction of semiconductor light emitters.