With　the　trend　of　larger　wind　turbine　rotors　to　utilize　morewind　energy,　wind　turbine　towers　are　becoming　consequently　higher　and　more　flexible.　Thus,　the　dynamic　response　of　towers　appears　more　significant　and　needs　to　be　controlled　to　avoid　potential　resonance　and　even　damage.　This　paper　proposed　a　new　type　of　double-track　nonlinear　energy　sink　(NES)　to　explore　its　mitigation　effects　on　dynamic　response　ofwind　turbine　towers.　Firstly,　the　double-trackNESis　designed　with　optimal　parameters.　Subsequently,　dynamic　response　of　the　onshore　wind　turbine　tower　with　the　double-track　NES　installed　are　investigated　experimentally　in　wind　tunnel.　A　comparison　of　dynamic　response　of　wind　turbine　tower　with　or　without　double-track　NES　control　is　presented　to　prove　that　the　novel　NES　can　rapidly　attenuate　the　response　of　the　underlying　tower,　for　both　in-flow　and　crossflow　directions.　This　study　reveals　the　potential　application　of　the　double-track　NES　in　dynamic　response　control　of　wind　turbine　tower.