GWP (global warming potential) of CFC (chlorofluorocarbon) alternatives is estimated from the atmospheric lifetime and the infrared absorption intensities. In general CFC alternatives are expected to be oxidized by OH radicals in the atmosphere. Therefore, study of the reactivity against OH radicals is indispensable for the evaluation of atmospheric lifetime of these molecules. We report the kinetic measurements with high accuracy for the reactions of OH radicals with CFC alternatives.