A　prefabricated　steel　frame　with　Z-shaped　cantilever　beam　splicing　is　proposed,　which　can　realize　a　good　seismic　performance　through　the　slip　of　the　splice.　The　moment-rotation　relationship　model　of　the　splice　is　constructed　through　force　analysis　about　various　states　of　loading　process　of　splice.　A　simulation　method　utilizing　connecting　element　of　ABAQUS　to　realize　the　constitutive　relation　of　the　splice　in　the　overall　structure　is　proposed.　Then　modal　analysis　and　pushover　analysis　are　conducted　on　the　modularized　prefabricated　column-tree　steel　frame　and　rigid　frame　under　the　same　condition,　and　the　result　shows　that　there　is　a　very　small　difference　of　the　natural　periods　of　vibration　of　the　two　frames　and　the　performance　points　under　seismic　action.　The　column-tree　frame　can　dissipate　seismic　energy　by　utilizing　slip　of　the　splice,　and　compared　with　the　rigid　frame,　the　column-tree　frame　achieves　the　purpose　of　multiaspect　seismic　fortification.