The kinetics of oxidation of liquid Cu-0.5mass%Ti alloy at 1473K in CO2-CO gas mixture has been investigated by varying the oxygen potential. The pO2 is set to be enough to oxidize Ti in liquid Cu-Ti alloy but not for the oxidation of liquid Cu. Alloy samples were taken with a quartz tube during the experiments and Ti and O contents in the samples were analyzed by inductively coupled plasma method, and infrared absorption method. The phases of the formed titanium oxide layers were consisted of several different titanium oxides and were identified by using EBSD. The oxidation rate was evaluated based on the change of the Ti content in the Cu-Ti melts. The apparent overall oxidation rate is reasonably represented by the parabolic rate law. This oxidation behaviour was well explained based on the multi-layered oxidation theory.