A　mild　steel-rolling　bearing　is　developed　according　to　the　seismic　isolation　of　the　space　frame　structure.　The　technical　problems　faced　in　the　engineering　application　are　preliminarily　discussed.　Firstly,　the　main　factors　influencing　the　value　of　the　horizontal　stiffness　of　the　bearing　are　analyzed　according　to　the　conceptual　model　of　the　bearings.　The　basic　method　which　can　identify　the　horizontal　stiffness　satisfy　the　requirement　of　the　release　of　the　thermal　stress　is　put　forward.　And　the　design　method　for　horizontal　stiffness　of　the　bearing　is　suggested.　Then　the　relationship　between　the　horizontal　stiffness　of　the　bearing　and　the　vibration　isolation　performance　of　the　space　frame　structure　is　analyzed.　It　is　proved　that　the　thermal　stresses　and　seismic　axial　force　of　the　structure　with　the　bearing　has　been　reduced　efficiently.