To alleviate "titanium Fire" produced during high pressure and friction of titanium alloy, Ti-V-Cr series and Ti-Cu-Al series burn resistant titanium alloys have been developed. In this work, through a modified direct current simulation burning tests, the burning characteristics, e.g., flame height, velocity and burning products are measured to evaluate the burn resistant behavior. It shows the burning behavior and reveals the corresponding burning mechanisms of titanium alloys with different alloying elements. The formation of V2O5 and Cr2O3 oxides during burning of Ti40 alloy enhances the density of oxide layer to block the oxygen diffusion, which leads to excellent burn resistant behavior indicated by the smaller burning velocity and lower flame height. For Ti14 alloys, in comparison, a clear Cu-rich layer is formed at the interface between burning product and heat affected zone, where it consumes oxygen by produces Cu-O compounds and to reduces the burning reaction with Ti-matrix. This work has established a fundamental understanding of how the alloying elements improve the burning resistance of titanium alloys.