Modal　parameter　identification　of　latticed　domes　with　ambient　excitation　was　analyzed　in　model　tests.　Analytical　results　are　compared　with　experimental　and　operational　modals　to　analyze　the　structural　response　of　latticed　domes　during　ambient　excitation　to　indentify　false　modals　and　to　calculate　the　identification　accuracy　of　frequency　domain　decomposition　(FDD).　The　analyses　show　that　the　participating　modals　in　structural　response　with　ambient　excitation　are　mainly　high-order　modals　for　latticed　domes　with　intensive　modals.　The　FDD　model　accurately　identifies　modal　frequencies.　The　FDD　identification　accuracy　is　also　high　for　modes　strongly　participating　in　the　structural　response.　The　false　modals　identification　is　based　on　the　magnitude　of　singular　value.　The　modal　corresponding　to　the　maximum　singular　value　can　be　treated　as　the　real　structural　modal　with　the　highest　identification　accuracy.