A liquid crystal composed of cholesteryl nonanoate and cholesteryl acetate was applied to measure the temperature distribution on a polyethylene film in partial discharge. The mea-surement of temperature distribution was perfomed by reading the color patterns on a color film after taking pictures at a fixed application time of voltage under various frequencies (0.2, 0.5, 1 and 3 kHz) and applied voltages (2_??_8 kV). Two types of electrodes were used. The temperature on the polyethylene film rises with increasing applied voltage and fre-quency. The rise in temperature is found to be a maximum at the site where the partial discharge concentrates. A comparison of the temperature distribution between a hemispherical bar and IEC (b) electrodes shows that the rise in temperature with the hemispherical bar elec-trode is smaller than that with the IEC (b) electrode.