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To improve mean-life and reliability of power cable, in this study, we have investigated volume resistivity and thermal properties showing by changing the content of carbon black, a semiconductive material for underground power transmission. Specimens were made of sheet form with the nine of specimens for measurement. Volume resistivity of specimens was measured by volume resistivity meter after 10 minutes in the preheated oven of both 25 ± 1°C and 90 ±1 °C. And thermal conductivity was measured by NFD (nano flash diffusivity). The measurement temperature was both 25 °C and 55 °C. From these experimental results, volume resistivity was high according to an increase of the content of carbon black. And thermal conductivity was increased according to an increase of the content of carbon black and also was increased by heating temperature. Because the movement of thermal electrons was rapidly promoted between carbon black particles, and the thermal vibrations of base resin atoms and carbon black thermal electrons were increased.