DCSB method is used to evaluate the burn resistant properties of Ti 40, Alloy C and Ti 6 4 three atmosphere conditions in this paper. The results show that Ti40 and Alloy C display good burn resistance as compared with Ti 6 4, and that the addition of nitrogen into air can decrease burning rate of titanium alloys. Burning interfaces were observed and analyzed by SEM and EDAX. It is found that which indicates that vanadium is preferentially immigrated to the surface to form V 2O 5 upon Ti40 and Alloy C burning. As a result the surface layer in burning zone is V enriched and Cr leaned, while the burned products and the oxidized layer close to matrix interface are V leaned and Cr enriched. The mixed oxidized layer is very dense, and can inhibite oxygen diffusion into the matrix, and prevent V in the matrix from diffusion into burning zone.Although Al can be preferentially immigrated to the surface to form Al 2O 3 upon Ti 6 4's burning, but it is too less in content to improve the alloy's burn proof ability.