The high temperature oxidation of Ti-Nb alloy layer prepared by a double-glow technique was investigated. The oxidation behavior of treated TA2 was analyzed at 700, 800 and 900 oC for 100 h in air by mean of XRD, SEM and EDS. The results show that the oxidation behavior of TA2 at 700~900 oC for 100 h is improved after niobium alloying process and the effect is more pronounced at 900 oC. Cross-section morphology and composition of the treated TA2 after subjecting to oxidation for 20, 40 and 100 h at 900 oC were characterized using SEM and EDS. The upper layer is composed of the mixed oxides (Nb2O5/TiO2), which are formed by the oxidation product of high concentration niobium alloyed layer; TiO2/TiO/Nb2O5 exist in a compact intermediate layer, and the inner layer are distributed with white stripe phase rich in niobium