Skirted　suction　caisson　is　a　new　type　of　suction　foundation　for　offshore　wind　power　engineering.　Model　tests　were　carried　out　to　investigate　the　variation　of　cumulative　rotation　angle　and　its　influencing　factors　of　the　regular　suction　caisson　(RSC)　and　skirted　suction　caisson　(SSC)　under　horizontal　cyclic　loading.　The　cyclic　loading　mode　includes　one-way　cyclic　loading　and　variable-amplitude　cyclic　loading.　The　experimental　results　showed　that　the　cumulative　rotation　angle　of　the　RSC　and　SSC　under　horizontal　cyclic　loading　mainly　occurs　within　the　first　200　loading　cycles.　The　cumulative　rotation　angle　was　found　to　increase　with　the　increase　of　cyclic　loading　amplitude　and　the　number　of　loading　cycles.　However,　the　increasing　rate　of　cumulative　rotation　angle　decreases　with　the　increase　of　loading　cycle　number.　The　relationship　between　the　cumulative　rotation　angle　and　the　number　of　loading　cycles　can　be　well　fitted　by　a　power　function.　By　using　Leblanc　method　and　Miner＇s　rule,　the　cumulative　rotation　angle　of　the　suction　caisson　foundation　under　long-term　variable-amplitude　cyclic　loading　was　transformed　into　that　under　constant　amplitude　cyclic　loading　and　then　can　be　estimated.　It　was　found　that　when　the　loading　amplitude　increases　step　by　step,　the　predicted　cumulative　rotation　angle　of　the　RSC　and　SSC　obtained　by　using　the　Leblanc　method　and　Miner＇s　law　is　slightly　higher　than　the　measured　model　test　results,　indicating　that　the　sequence　and　amplitude　of　cyclic　loading　have　a　certain　influence　on　the　cumulative　rotation　angle　of　the　suction　caisson　foundation.　In　addition,　the　influence　of　cyclic　loading　on　the　ultimate　bearing　capacity　of　suction　caisson　foundation　was　studied　and　it　was　found　that　the　ultimate　bearing　capacities　of　the　RSC　and　SSC　after　cyclic　loading　are　higher　than　those　before　cyclic　loading.　The　research　results　can　provide　a　basis　for　the　design　of　the　suction　caisson　foundation　of　offshore　wind　power.　©　2021,　Science　Press.　All　right　reserved.