Volterra　theory-based　reduced-order　modeling　(ROM)　technique　is　utilized　for　simulating　fluid-structure　interactions　of　bridge　decks　during　vortex-induced　vibration　(WV).　To　improve　the　order　of　nonlinearity　adopted　in　the　Volterra　series,　sparse　form　kernels　are　adopted　in　this　study.　To　illustrate　and　validate　the　performance　of　ROM　in　simulating　fluid-structure　interactions　of　WV,　a　real　bridge　deck　is　used　as　a　case　study.　The　kernels　in　the　Volterra　series　are　identified　using　least　squares　with　input　output　pairs　obtained　from　a　CFD　approach.　Results　indicate　that　ROM　can　well　reproduce　the　inherent　nature　of　nonlinearities　existing　in　fluid-structure　interactions　described　by　the　CFD　approach.　A　method　for　calculating　the　WV　of　bridges　by　combining　ROM　with　the　structural　finite　element　model　is　also　proposed.　The　VIV　performance　of　a　real　bridge　is　obtained　through　the　proposed　method　and　is　compared　with　field　measurements.