Abstract: The extraction kinetic behaviors of technetium in TcO₄^-/HNO₃/TBP-kerosine, TcO₄^-/HNO₃-Zr/TBP-kerosine, TcO₄^-/HNO₃-U/TBP-kerosine and TcO₄^-/HNO₃-Zr-U/TBP-kerosine system were studied with a mini-sized Lewis cell. The extraction kinetic equations and apparent rate constants of TcO₄^- in these systems were calculated and the mechanism was discussed in this paper. In these systems, the rate of the extraction of Tc(Ⅶ) declines with the rise of temperature, and the apparent active energy is turned out to be minus value.