On the basis of common Metal/Insulator/Metal (MIM) junction, a new structure of Al Al 2O 3 Dy Au junction containing the rare element Dy was prepared. The preparation process was described simply. The light emission characteristics of MIM and MIDyM junction and the property of surface plasmon polariton (SPP) dispersion are discussed. The light spectra and the effect of rare earth element Dy on the light emission tunnel junction are analysed.