Damage　of　connecting　place　between　upper　roofs　and　bottom　substructures　are　one　of　the　main　earthquake　damages,　as　is　shown　in　many　earthquakes.　To　reduce　the　probability　of　this　kind　of　damage,　a　separated　substructure　design　method　was　proposed.　The　substructures　were　divided　into　two　parts:　one　part　sustaining　horizontal　and　part　vertical　loads　of　the　roof　and　the　other　part　only　sustaining　the　rest　of　vertical　loads　of　the　roof.　The　former　substructure　was　connected　with　the　roof　using　steel　structures　with　larger　elastic　deformation.　The　latter　substructure　was　connected　with　the　roof　using　horizontal　sliding　bearings,　so　horizontal　shear　force　was　released　to　reduce　the　damage　probability　of　bearings.　FE　models　for　a　typical　single-layer　latticed　dome　and　its　bottom　substructures　were　built　based　on　this　design　idea.　Their　dynamic　performances　were　computed　under　smaller　and　stronger　earthquakes　based　on　contemporary　design　codes,　the　results　showed　that　the　dome　and　the　part　of　its　bottom　substructures　sustaining　horizontal　and　part　vertical　loads　of　the　roof　can　be　computed　independently,　and　the　dome＇s　temperature　stress　can　be　released　effectively;　the　aseismic　performances　of　the　structure　are　good　under　smaller　and　stronger　earthquakes;　it　costs　less　steel　to　be　used.　©　2018,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.