Oceanic Chlorofluorocarbons (CFCs) are very significant in climate change and ocean’s circulation study. CFCs have greenhouse effect and are useful tools for modern marine research. CFCs, as chemical tracers, have been widely used to assess ocean circulation and marine ventilation pathways, and to identify the mixing processes of water mass movement. CFCs are often used to calculate the “age” of water masses and rates of ocean mixing and circulation, and to evaluate airsea exchange rate. The progressess of studies of oceanic CFCs in the past several decades are reviewed in this paper. The distribution characteristics and flux of CFCs in the ocean, and their application to marine research and analytical methods  are introduced. Their distribution characteristics in the atmosphere are also described. Some questions   for further research in this area are proposed.