Helical　anchors　have　been　widely　used　to　support　the　structures　suffering　from　cyclic　uplift　loading,　such　as　wind　turbines　and　transmission　towers,　due　to　their　good　uplift　resistance.　And　the　studies　on　cyclic　performance　of　helical　anchors　are　limited.　Therefore,　centrifugal　tests　of　helical　anchors(wished-in-place)　in　dense　sand　under　cyclic　loading　were　conducted　to　investigate　the　effects　of　embedment　ratio　and　number　of　helices　on　cyclic　uplift　stability　and　cyclic　capacity.　Test　results　show　that　the　uplift　displacements　at　the　beginning　of　ultimate　cyclic　loading　level　are　very　close　to　the　failure　displacements　under　monotonic　loading　for　single-helix　anchors.　Relative　ultimate　cyclic　uplift　capacity　Qcumean/Qmu　for　single-helix　anchor　increases　gradually　with　the　increase　of　embedment　ratio　H/D　and　reaches　the　maximum　value　0.9　at　the　embedment　ratio　of　6,　and　then　the　value　of　Qcumean/Qmu　almost　keeps　constant　when　embedment　ratio　is　more　than　6.　Moreover,　the　relative　accumulated　displacements　during　each　cyclic　loading　for　single-helix　anchors　with　embedment　ratio　less　than　6　are　all　higher　than　the　anchors　with　embedment　ratio　more　than　6.　Therefore,　minimum　embedment　ratio　for　single-helix　anchor　is　proposed　as　6　when　it　is　used　to　resist　cyclic　uplift　loading.　The　relative　ultimate　cyclic　uplift　capacity　of　double-helix　anchor　is　the　same　as　that　of　single-helix　anchor　with　the　same　embedment　ratio,　but　the　accumulated　displacements　during　each　cyclic　loading　for　double-helix　anchor　are　all　less　than　those　values　for　single-helix　anchor.　Double-helix　anchor　should　have　higher　cyclic　uplift　capacity　than　single-helix　anchor　if　displacement　is　taken　as　control　condition.　©　2021,　Science　Press.　All　right　reserved.