Traditional　control　strategies　have　difficulty　handling　nonlinear　behavior　of　structures,　time　variable　features　and　parameter　uncertainties　of　structural　control　systems　under　seismic　excitation.　An　off-and-towards-equilibrium　(OTE)　strategy　combined　with　fuzzy　control　is　presented　in　this　paper　to　overcome　these　difficulties.　According　to　the　OTE　strategy,　the　control　force　is　designed　from　the　viewpoint　of　a　mechanical　relationship　between　the　motions　of　the　structure,　the　exciting　force　and　the　control　force.　The　advantage　of　the　OTE　strategy　is　that　it　can　be　used　for　a　variety　of　control　systems.　In　order　to　evaluate　the　performance　of　the　proposed　strategy,　the　seismic　performance　of　a　three-story　shear　building　with　an　Active　Tendon　System　(ATS)　using　a　Fuzzy　Logic　Controller　(FLC)　is　studied.　The　main　advantage　of　the　fuzzy　controller　is　its　inherent　robustness　and　ability　to　handle　any　nonlinear　behavior　of　structures.　However,　there　are　no　design　guidelines　to　set　up　the　corresponding　control　rule　table　for　a　FLC.　Based　on　the　proposed　strategy　for　the　FLC,　a　control　rule　table　associated　with　the　building　under　study　is　developed,　which　then　allows　formation　of　a　detailed　algorithm.　The　results　obtained　in　this　study　show　that　the　proposed　strategy　performs　slightly　better　than　the　linear　quadratic　regulator　(LQR)　strategy,　while　possessing　several　advantages　over　the　LQR　controller.　Consequently,　the　feasibility　and　validity　of　the　proposed　strategy　are　verified.