Carbon nanotubes (CNT), as a conducting material, have been widely used in the Chinese battery industry. CNT need to be purified for use in battery as conducting agent. Here, CNTs prepared by chemical vapor deposition(CVD) were purified at 3 000 ℃ using Acheson furnace and the structure and electrical behavior of the CNT were investigated. The CNT were characterized in detail with SEM, EDS, ICP, FT-IR, TGA, XPS, Raman and Four point resistor. The results show that the CNT purified at high temperature only have less than 71ppm (weight percent) iron content, and 0.45wt% oxides content. Besides, the CNT also have a better graphite crystal structure and fewer surface function group. The volume resistivity of the CNT ranges from 0.050 Ω·cm to 0.035 Ω·cm. As a conductive material of battery electrode, it can be used as positive electrode of power battery.