The kinetics of decomposition of tetrachloromethane (TCM) in its aqueous solutions and the kinetics of decomposition products formation was investigated under the action of DBD at atmospheric pressure in oxygen in a falling-flow reactor. The range of initial concentrations of TCM was 25-325mol/l, the discharge power2-11W and O-2 flow rates1-3cm(3)/s. It is shown that the kinetics of the TCM decomposition can be described by the equation of pseudo-first kinetic order. The rate constant depended weakly on the discharge parameters and was similar to 5s(-1). The energy efficiency of the decomposition, depending on the parameters, was 0.1-1.3 molecules per 100eV. When the residence time of the solution with the discharge zone is more than 1s, it is possible to achieve almost 100% degree of TCM decomposition. It is shown that the main products of the TCM decomposition in the liquid phase are aldehydes and Cl- ions, and in the gas phasethe molecules CO and CO2. The results for energy efficiency are compared with the results obtained in other AOP's processes (Fenton process, photocatalytic process, the radiation process by the action of high-energy electron flux). It is shown that the action of the DBD is more effective than the action of the above processes.