The　damage　of　reticulated　shell　structure　will　arouse　structural　mode　localization.　The　quantitative　assessment　index　of　mode　localization　is　defined.　A　scale　model　experiment　for　mode　localization　is　carried　out　on　a　Kiewit　single-layer　spherical　reticulated　shell　structure,　and　the　features　of　mode　localization　are　studied.　Four　cases　about　structural　stiffness＇　change　are　constructed　in　the　experiment,　and　three　structural　modals　are　obtained　at　random.　The　localization　of　the　three　modes　is　analyzed　under　each　case.　The　results　show　that　slight　changes　of　physical　parameters　are　likely　to　arouse　obvious　localization　of　some　modes　for　reticulated　shell　structure.　©　(2011)　Trans　Tech　Publications.