This　paper　presents　an　innovative　type　of　mountain　wind　turbine　foundation,　namely,　the　cone-shaped　hollow　flexible　reinforced　concrete　foundation　(CHFRF).　It　consists　of　a　top　plate,　a　base　plate　and　a　side　wall　that　are　made　of　reinforced　concrete.　The　cavity　of　the　CHFRF　is　filled　with　rubble　and　soil　directly　from　the　excavation　for　the　CHFRF,　which　means　that　it　can　absorb　the　spoil.　A　rubber　layer　is　placed　beneath　the　CHFRF　to　increase　the　foundation　flexibility　to　resist　cyclic　and　dynamic　loadings　and　to　increase　the　bearing　capacity.　The　great　advantages　of　the　CHFRF　are　the　reduction　in　the　usage　of　concrete　and　steel　and　the　protection　of　the　vegetation　around　the　wind　turbine,　compared　with　conventional　mountain　wind　turbine　foundations　that　are　solid　structures.　It　is　verified　through　model　tests　and　a　numerical　simulation　that　the　CHFRF　can　provide　higher　lateral　bearing　capacity　in　comparison　to　the　regular　circular　gravity-based　foundation　under　the　same　foundation　diameter　and　height,　and　that　the　bearing　capacity　is　increased　by　approximately　33.5%　accordingly.　It　is　also　found　that　the　rubber　layer　can　effectively　reduce　the　accumulated　rotation　of　the　CHFRF　under　cyclic　loading.　The　accumulated　rotation　of　the　CHFRF　with　a　rubber　layer　having　a　thickness　of　4　mm　is　decreased　by　about　50%　compared　to　that　of　the　CHFRF　with　a　rubber　layer　having　a　thickness　of　2　mm.　In　addition,　the　volume　of　concrete　used　for　the　CHFRF　is　only　one-fifth　of　that　used　for　the　circular　gravity-based　foundation.　Therefore,　the　CHFRF　outperforms　regular　mountain　wind　turbine　foundations.　(C)　2019　Production　and　hosting　by　Elsevier　B.V.　on　behalf　of　The　Japanese　Geotechnical　Society.