Through　the　modal　analysis　and　test　of　the　1:10　down-scale　model　test　of　60　m　circular　spoke　cable-trusses,　the　influences　of　three　parameters　including　the　cable　prestress,　rise　to　span　ratio,　as　well　as　the　diameter　ratio　of　inner　and　outer　ring　on　the　natural　vibration　characteristics　of　the　structure　were　investigated.　The　results　obtained　from　test　and　theoretical　formulation　of　the　first　four　order　modal　were　compared　and　analyzed.　It　can　be　seen　that:　The　first　and　the　second　order　vibration　modes　of　the　structure　are　antisymmetric　upper　and　lower　vibrations,　the　third　order　is　the　inner　ring　torsional　vibration,　and　the　fourth　order　is　the　relative　torsional　vibration　of　the　inner　ring.　The　frequency　error　is　less　than　10%,　and　the　experimental　mode　of　vibration　is　in　good　agreement　with　the　theoretical　mode.　The　frequencies　of　the　first　four　modes　are　all　larger　than　10　Hz,　indicating　that　the　spoke　cable　truss　structure　is　of　low　frequency　dynamic　response,　and　the　natural　frequency　is　small　and　the　distribution　is　dense.　When　prestress　level　of　the　structure　is　higher,　the　modal　frequency　will　increase,　and　the　stiffness　will　also　increase.　With　the　increase　of　sagittal　height,　the　structural　frequency　will　decrease,　and　the　structure　is　more　prone　to　lateral　instability.　With　the　increase　of　the　inner　and　outer　ring　diameter　ratio,　the　torsion　stiffness　of　structure　will　decrease　and　torsion　instability　will　also　occur.　©　2019,　Editorial　Department　of　JCEE.　All　right　reserved.