The　limit　of　height-width　ratio　of　high-rise　base-isolated　structure　with　rubber　bearings　was　investigated.　With　3-particle　model　being　adopted,　the　limit　ratio　formulas　were　derived　and　the　results　were　presented　corresponding　to　various　kinds　of　building　categories,　earthquake　fortification　intensities,　site　classifications,　and　damping　ratios　of　structure.　In　conformity　to　the　principle　of　simplicity　and　safety,　the　calculated　limit　ratios　were　summarized.　By　comparing　the　results　with　those　of　single-particle　model,　it　is　shown　that　there　is　little　difference　between　them,　which　indicates　that　high-order　modes　have　little　effect　on　the　limit　of　height-width　ratio　of　high-rise　base-isolated　structure.　The　changes　of　the　limit　of　height-width　ratio　were　further　discussed　when　the　basic　period　is　not　equal　to　the　critical　period,　and　it　is　found　that　when　the　basic　period　is　less　than　the　critical　period,　the　limit　of　height-width　ratio　dose　not　significantly　reduce,　and　when　the　basic　period　is　greater　than　critical　period,　the　limit　of　height-width　ratio　reduces　obviously.