The　failure　mechanism　of　Ti60　titanium　alloy　in　the　high　cycle　fatigue　(HCF)　and　very　high　cycle　fatigue　(VHCF)　at　different　temperatures　was　investigated.　The　results　showed　that,　at　different　temperatures,　there　are　two　different　fatigue　failure　mechanisms,　i.e.,　the　oversized　facet　and　oxide　shedding　failure　mechanisms.　At　room　temperature,　most　of　the　fatigue　cracks　initiate　at　the　oversized　facet.　At　300℃,　the　crack　initiates　at　the　oversized　facet　for　the　test　with　small　applied　stress,　while　the　crack　initiates　at　the　oxide　shedding　site　for　the　test　with　large　applied　stress.　At　400℃,　all　the　fatigue　cracks　initiate　at　the　oxide　shedding　site.　Higher　temperature　and　stress　will　be　conducive　to　the　failure　mechanism　of　oxide　shedding　to　become　dominant.　©　2023