Coiled　Tubing　(CT)　is　disturbed　by　ocean　loads　when　milling　in　deep　water.　The　CT＇s　axial　force　under　different　buckling　states　and　ocean　loads　also　varies.　In　this　study,　to　analyze　the　influence　of　ocean　load　on　the　axial　force　of　coiled　tubing　under　different　buckling　states,　we　establish　an　experimental　＇pipe-in-pipe＇　system　under　different　ocean　loads.　By　simulating　the　outer　pipe＇s　deformation　under　different　ocean　loads,　the　influence　of　buckling　states　and　ocean　loads　on　the　CT＇s　axial　force　transfer　characteristics　is　studied.　The　results　show　that　when　the　CT＇s　buckling　state　is　the　same,　the　greater　the　ocean　load,　the　greater　is　the　axial　force　fluctuation.　Additionally,　when　the　ocean　load　is　the　same,　the　greater　the　CT＇s　buckling　degree,　the　greater　is　the　axial　force　fluctuation,　but　the　axial　force　transmission　efficiency　is　improved.　Besides,　the　ocean　load　has　little　effect　on　the　axial　force＇s　transmission　efficiency.　The　results　provide　theoretical　guidance　for　deepwater　milling　using　coiled　tubing.