In　order　to　identify　the　damping　and　vibration-reduction　characteristics　of　metallic　cylindrical　sandwich　shell　under　high　temperature　condition,　a　metal-rubber　material　with　excellent　temperature　resistance　and　viscoelastic　damping　characteristics　was　adopted　as　the　sandwich　core　for　damping　layer.　The　effects　of　internal　structural　parameters　and　external　excitation　conditions　on　the　dynamic　mechanical　characteristics　of　cylindrical　sandwich　shell　with　metal-rubber　under　different　temperature　gradients　were　studied.　Firstly,　the　traditional　metal-rubber　stamping　preparation　process　and　vacuum　brazing　connection　process　were　combined　to　realize　the　reliable　metallurgical　combination　on　the　panel/core　interface　of　sandwich　cylindrical　shell　structural.　The　persistent　temperature　resistance　of　the　prepared　sample　can　be　up　to　500　℃.　Secondly,　the　effects　of　key　parameters　such　as　the　core　density,　the　thickness　ratio　of　panel　and　core　and　the　gradient　temperature　on　the　high-temperature　damping　characteristics　by　different　excitation　conditions　were　analyzed.　The　main　performance　evaluation　indexes　include　the　secant　stiffness,　the　natural　frequency,　the　vibration　acceleration　level　and　the　high　temperature　damping　ratio.　Comparing　to　the　non-sandwich　cylindrical　shell　with　equal　quality,　the　stiffness　of　cylindrical　sandwich　shell　with　metal-rubber　is　positively　correlated　with　the　panel　thickness　and　the　core　density.　The　damping　effect　decreases　in　the　temperature　range　of　0~300　℃,　but　increases　in　the　temperature　range　of　300~500　℃.　©　2023　Rare　Metals　Materials　and　Engineering　Press.　All　rights　reserved.