This　paper　investigates　the　potential　use　of　an　equivalent　cylindrical　shell　model　to　analyze　the　vibration　of　a　ring　truss　structure　for　a　large　deployable　circular　mesh　antenna　clamped　along　one　generatrix.　The　simplified　method,　which　reduces　the　three-dimensional　cell　structure　into　a　two-dimensional　＂flattened＂　cell　structure　of　the　ring　truss,　is　presented.　According　to　the　drum-like　structure　of　the　antenna,　the　equivalent　cylindrical　shell　model　of　the　ring　truss　structure　is　established.　Using　the　flattened　cell　structure,　the　equivalent　membrane　stiffness　and　bending　stiffness　are　derived　by　using　the　equivalent　process　and　the　homogenization　method.　The　differential　governing　equation　of　motion　for　the　equivalent　cylindrical　shell　clamped　along　one　generatrix　is　established　based　on　the　Donnell　thin　shell　theory.　The　theoretical　results　are　verified　by　numerical　simulations.　The　natural　frequencies　of　the　equivalent　cylindrical　shell　are　calculated　with　the　non-normal　boundary　condition　clamped　along　one　generatrix.　The　natural　frequencies　are　compared　to　ones　obtained　using　a　full-scale　model　by　using　the　finite　element　method　(FEM).　The　mode　shapes　of　the　equivalent　cylindrical　shell　agree　well　with　the　ones　of　the　ring　truss　structure　for　the　full-scale　finite　element.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.