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　V2O5　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　Al2O3　upon　Ti-6-4＇s　burning,　but　it　is　too　less　in　content　to　improve　the　alloy＇s　burn-proof　ability.