1,2-Dichloroethane (EDC) is known to be hazardous to the environment and public health. In this study, application of radio frequency (rf) plasma as an alternative technology for the decomposition of EDC was demonstrated. The species detected in the effluent gas stream included CO2, CO, HCl, CCl4, C2HCl3, C2H3Cl, C2Cl4, CHCl3, C2HCl5, COCl2, C2H2 C2H4, C2H6, and HCOOH. The decomposition fraction of EDC [eta(C2H4Cl2), (C-in -C-out)/C-in x 100 (%)] was dependent on input power. When input power was 80W, stable products such as CO, CO2, and HCl were dominant and other product species were inhibited. Equivalence ratio [(phi = (C2H4Cl2/O-2)(actual) x (O-2/C2H4Cl2)(stoichiometric)] was the other important operational parameter in a plasma system. When the chlorocarbon/oxygen flow was fuel rich, more soot formation was found in the plasma reactor. When it was fuel lean, CO2 and CO dominated over other product species. Within the mixture of EDC and dichloromethane (I)CM), the competition of DCM with EDC could affect the decomposition fraction of EDC.