Seismic　activity　often　triggers　liquefaction　in　sandy　soils,　which　coupled　with　initial　vertical　tensile　loads,　poses　a　significant　threat　to　the　stability　of　suction　bucket　foundations　for　floating　wind　turbines.　However,　there　remains　a　notable　dearth　of　studies　on　the　dynamic　response　of　these　foundations　under　combined　seismic　and　vertical　tensile　loads.　Therefore,　this　study　developed　a　numerical　method　for　analyzing　the　dynamic　response　of　suction　bucket　foundations　in　sandy　soils　under　such　combined　loading　conditions.　Through　numerical　simulations　across　various　scenarios,　this　research　investigates　the　influence　of　key　factors　such　as　seismic　intensity,　spectral　characteristics,　as　well　as　the　magnitude　and　direction　of　tensile　loads　on　the　seismic　response　of　suction　buckets.　The　results　revealed　that　the　strong　earthquake　may　cause　the　suction　bucket　foundation　of　floating　wind　turbines　to　fail　due　to　excessive　vertical　upward　displacement.　This　can　be　attributed　to　that　the　accumulation　of　excess　pore　water　pressure　reduces　the　normal　effective　stress　on　the　outer　wall　of　bucket,　and　consequently　decreases　the　frictional　resistance　of　bucket-soil　interface.　Additionally,　the　above　factors　significantly　influence　both　the　vertical　displacement　of　the　suction　bucket　and　the　development　of　pore　pressure　in　the　surrounding　soil.　The　findings　can　provide　valuable　insights　for　the　seismic　safety　assessment　of　suction　bucket　foundations　used　in　tension-leg　floating　wind　turbines.