Abstract: The purification process of the sintered tantalum rod is studied, and the results show that sheath for the molding of tantalum rod contributes to the surface contamination, which leads to the increase of C content. The latex sheath with low cracking temperature can effectively reduce the residual C compared with the rubber sheath. High temperature sintering can remove part of the residual impurities, but to completely remove them is very difficult. The HNO₃ + HF acid system can effectively remove the inclusion in the surface of the tantalum rod and achieve the purification of the tantalum rod.