The　displacement　ratio　of　asymmetric　buildings　does　not　meet　specifications　of　the　design　codes　due　to　the　inconsistency　of　the　mass　center　and　the　rigidity　center.　It　is　effective　to　install　displacement-based　energy　dissipative　devices　to　reduce　the　displacement　ratio　of　asymmetric　buildings.　However,　the　parameters　and　the　locations　of　displacement-based　energy　dissipative　devices　determine　the　torsional　response.　In　order　to　investigate　the　torsional　response,　a　two-way　eccentric　frame　structure　is　analyzed　in　this　paper.　An　optimization　model　based　on　artificial　fish　swarm　and　finite　element　software　SAP2000API　is　proposed　for　the　optimal　design　of　displacement-based　energy　dissipative　devices　in　asymmetric　buildings.　The　optimization　model　is　designed　for　real　structures　which　have　multi-degrees　of　freedom　to　derive　the　optimum　location　and　parameters　of　devices.　Finally,　the　optimization　model　is　applied　in　a　multi-storey　eccentric　structure　which　does　not　meet　the　specifications　to　obtain　the　optimal　design　of　displacement-based　energy　dissipative　devices,　which　is　found　to　be　able　to　control　the　displacement　ratio　efficiently.　©　2016,　Engineering　Mechanics　Press.　All　right　reserved.