Based on two retired cross-linked polyethylene (XLPE) cables with different service years and a spare cable, the changes in dielectric properties of XLPE from different positions of cable insulation are studied. The XLPE samples are sliced from the cables, and the dielectric spectra are measured at eight temperature points located between 50℃ and 250℃, respectively. The results show that the spectra of complex dielectric constant for XLPE at super-high temperature exhibits regular change with frequency. Then, the electrical conductivity and peak frequency of the relaxation peak decrease firstly and inversely increase with the cable service year, which can be good index to show the changes in dielectric properties of cables. The difference in the activation energy corresponding to the peak frequency of the relaxation peak and the central angle corresponding to the Cole-Cole plots at different insulation positions of the same cable decrease firstly and inversely increase with the cable service year, which can well reveal the difference in dielectric properties of the different positions from the same cable. The variation in dielectric property of each sample at super-high temperature with its service year can be used as an effective method to evaluate the insulation status of XLPE cable.