An　aqueduct　is　a　controlling　structure　in　water　diversion　engineering,　which　can　possibly　be　damaged　during　earthquakes,　triggering　interruptions　in　the　supply　of　water.　Although　numerous　aqueducts　have　been　built　and　operated,　research　on　aqueduct　earthquake　resistance　is　not　sufficient,　and　simplified　seismic　design　methods　for　aqueducts　are　not　unified.　Based　on　fluid-structure　interaction　dynamics　and　response　spectra　analysis,　a　simplified　formula　was　proposed　to　calculate　the　transverse　seismic　response　of　aqueducts.　The　obtained　result　was　compared　with　the　results　derived　using　nonlinear　finite　element　time-history　response　calculation　of　fluid-structure　interaction.　It　is　concluded　that　the　simplified　method　proposed　in　this　paper　can　quickly　calculate　the　transverse　seismic　response　of　aqueducts.　Additionally,　the　results　not　only　can　effectively　reflect　the　damping　effect　of　the　water　sloshing　acting　on　aqueduct　structure,　but　also　matched　well　with　the　numerical　analysis　results.　©　2017,　Engineering　Mechanics　Press.　All　right　reserved.