Prefabricated　hybrid　wind　turbine　towers　(WTTs)　are　promising　due　to　height　increase.　This　study　proposes　the　use　of　ultra-high　performance　concrete　(UHPC)　to　develop　a　new　type　of　WTT　without　the　need　to　use　reinforcement.　It　is　demonstrated　that　the　UHPC　WTT　structure　without　reinforcing　bars　could　achieve　performance　similar　to　that　of　reinforced　concrete　WTTs.　To　simplify　the　design　of　WTT,　a　design　approach　for　the　calculation　of　stresses　at　the　horizontal　joints　of　a　WTT　is　proposed.　The　stress　distribution　near　the　region　of　the　horizontal　joint　of　the　WTT　structure　under　normal　operating　conditions　and　different　load　actions　is　studied　using　the　proposed　approach,　which　is　validated　by　the　finite　element　method.　A　further　parametric　study　shows　that　the　degree　of　prestressing　and　the　bending　moment　both　significantly　affect　the　principal　stress.　The　shear-to-torsion　ratio　also　shows　a　significant　influence　on　the　principal　tensile　stress.