Proposed　herein　is　a　new　vibration-reduction　technique　for　multi-adjacent-building　systems　subjected　to　earthquake　excitations.　Based　on　a　three-building　model,　three　different　connecting　methods　are　presented　for　reducing　the　seismic　response　of　the　multi-building　system.　After　the　equation　of　motion　is　derived,　a　numerical　example　is　employed　to　demonstrate　the　seismic　performances　of　the　controlled　systems.　The　vibration-reduction　mechanism,　the　vibration-reduction　effect,　and　the　influential　parameters　are　also　studied.　Numerical　results　show　that　the　method　of　coupling　adjacent　structures　is　a　viable　and　attractive　vibration-reduction　strategy　for　seismically　excited　structures.