Ti-48Al and Ti-48Al-2Cr-2Nb alloys were fabricated by in-situ alloying assisted double-wire arc additive manufacturing. The microstructure and properties of the two alloys were characterized by XRD, OM, SEM, micro mechanical tensile test and high temperature oxidation test. The results showed that both of these two deposited alloys showed quite uniform components and composed of γ-TiAl and α2-Ti3Al. The addition of tracing Cr and Nb showed no significant effect on microstructure. Micro tensile testing showed that ultimate strength elevated after the addition of Cr and Nb yet no significant effect to plasticity. High temperature oxidation resistance test confirmed that Ti-48Al-2Cr-2Nb has a good resistance to oxidation compared to Ti-48Al. The final weight gain of the sample decreased from 5.26mg /cm2 to 1.95mg /cm2.