A　new　type　of　control　device,　which　is　fit　for　the　horizontal　seismic　isolation　of　a　bearing　involved　three-dimensional　seismic　isolation　for　spatial　latticed　structures,　is　introduced　in　the　paper.　The　device　is　combined　frictional　sliding　system　with　helical　springs.　The　horizontal　seismic　isolation　of　the　device　mainly　depends　on　frictional　sliding　system,　and　its　restoring　force　comes　from　the　incorporated　helical　springs.　Based　on　the　device,　the　mathematical　model　of　the　system　was　developed,　and　the　relationship　between　sliding　coefficient　and　amplitude　of　the　sliding　displacement　were　established.　Meanwhile,　the　formula　for　stiffness　calculating　of　the　springs　was　derived.　In　addition,　the　design　method　for　the　system　was　advised.