In　order　to　study　the　influence　of　the　velocity　pulse　to　seismic　displacement　response　of　base-isolated　buildings　and　the　differences　of　the　influent　of　the　two　types　of　near-fault　ground　motions　with　velocity　pulse　to　seismic　response　of　base-isolated　buildings,　the　seismic　responses　were　analyzed　by　three　dimensional　finite　element　models　for　three　base-isolated　buildings,　4　stories,　9　stories　and　14　stories.　In　this　study,　comparative　analyses　were　done　for　the　seismic　displacement　responses　of　the　base-isolated　structures　under　6　near-fault　ground　motion　records　with　velocity　pulse　and　no　velocity　pulse,　in　which,　6　artificial　ground　motion　time　histories　with　same　elastic　response　spectrum　as　the　6　near-fault　ground　motion　records　were　used　as　the　ground　motion　with　no　velocity　pulse.　This　study　indicates　that　under　the　ground　motions　with　velocity　pulse　the　seismic　displacement　response　of　base-isolated　buildings　is　significantly　increased　than　the　ground　motions　with　no　velocity　pulse.　To　the　median-low　base-isolated　buildings,　the　impact　of　forward　directivity　pulses　is　bigger　than　fling-step　pulses.　To　the　high　base-isolated　buildings,　the　impact　of　fling-step　pulses　is　bigger　than　forward　directivity　pulses.　The　fling-step　pulses　lead　to　large　displacement　response　in　the　lower　stories.