In　this　paper,　the　friction　between　the　bump　foil　and　the　flat　foil　and　between　the　bump　foil　and　the　bearing　housing　is　taken　into　account　to　evaluate　the　effects　of　coulomb　friction　on　bump　foil　gas　bearing.　The　displacement　of　a　single　bump　is　calculated　using　the　finite　element　beam　model.　Thereafter,　the　stiffness　and　damping　characteristics　of　the　bearing　are　evaluated　through　energy　dissipation　method.　The　effects　of　load　reference　value,　load　fluctuation　amplitude　and　friction　coefficient　on　energy　dissipation　and　foil　stiffness　are　analyzed.　The　results　indicate　that　the　energy　dissipation　increases　as　the　reference　value　and　fluctuation　amplitude　increase,　which　is　conducive　to　the　operating　stability.　The　stiffness　grows　rapidly　and　then　asymptoticly　stabilizes　as　the　amplitude　increases.　The　stiffness　basically　does　not　change　with　the　reference　value.　When　the　load　decreases　from　the　maximum　value,　the　friction　at　the　bump　top　still　remains　as　sliding　friction　at　the　beginning.　After　entering　the　hysterias　condition,　the　sliding　friction　gradually　turns　into　static　friction,　and　the　direction　of　friction　changes　from　the　same　direction　to　the　opposite　direction.　In　the　bearing　design　process,　the　optimal　friction　coefficient　should　be　selected　properly　based　on　the　principle　in　favor　of　support　stiffness　or　energy　dissipation.　©　2022　Xi＇an　Jiaotong　University.　All　rights　reserved.