In　this　paper,　the　analysis　of　vibration　and　aeroelastic　properties　of　ordered　and　disordered　two-span　panels　is　carried　out.　The　equation　of　motion　of　each　sub-panel　of　the　two　spans　is　formulated　using　Hamilton＇s　principle.　Supersonic　piston　theory　is　applied　to　evaluate　the　unsteady　aerodynamic　pressure.　The　partial　differential　equation　of　motion　of　the　two-span　panel　is　solved,　and　the　mode　shapes　of　the　panels　with　and　without　aerodynamic　pressure　are　obtained.　The　free　vibration　behaviors　of　the　two-span　panel　are　analyzed.　Time-domain　responses　of　the　panel　are　computed　by　the　mode　superposition　method　using　the　mode　shapes　obtained　previously.　It　is　noted　from　the　free　vibration　analysis　that　the　vibration　localization　will　happen　on　the　disordered　two-span　panel.　Aeroelastic　analyses　of　ordered　and　disordered　two-span　panels　are　also　carried　out　through　the　frequency-domain　method.　Characteristics　of　the　aeroelastic　stability　and　fluttering　mode　of　the　disordered　two-span　panel　are　analyzed.　Simulation　results　show　that　the　disorder　of　the　two-span　panel　will　decrease　the　critical　flutter　aerodynamic　pressure　of　the　structural　system.　The　influences　of　the　disorder　degree　on　the　vibration　localization　and　the　flutter　bound　of　the　two-span　panel　are　investigated.　The　present　results　are　useful　for　the　analysis　and　design　of　the　multi-span　structures.　(c)　2014　Elsevier　Ltd.　All　rights　reserved.