The　turn　domain　resampling　(TDR)　method　is　proposed　in　the　paper　on　the　basis　of　the　existing　angle　domain　resampling　for　solving　the　problem　of　non-fixed　fault　frequency　under　variable　working　conditions.　TDR　can　select　the　appropriate　sampling　order　according　to　the　influence　of　frequency　conversion,　which　avoided　the　error　caused　by　the　spline　interpolation　method.　It　can　provide　accurate　parameters　for　the　subsequent　calculation　of　the　equivalent　frequency　order.　Variable　multi-scale　morphological　filtering　(VMSMF)　method　is　proposed　for　the　purpose　of　further　reducing　the　interference　of　noise　in　resampling　signal　to　feature　extraction.　VMSMF　adaptively　selects　structural　elements　according　to　the　parameter　change　of　impact　signal　to　make　its　scale　more　targeted.　It　only　needs　to　calculate　once　using　the　optimal　structural　unit　for　a　particular　impact,　and　the　filtering　accuracy　and　operating　efficiency　have　been　greatly　improved.　The　main　steps　of　this　article　are　as　follows.　First,　the　TDR　is　used　to　resample　the　original　signal　as　to　get　the　resampling　signal　which　is　still　submerged　by　the　strong　noise.　In　the　second　step,　VMSMF　is　used　to　filter　the　resampling　signal　to　obtain　the　signal　with　less　noise　interference.　Finally,　the　fault　characteristics　of　the　filtering　signal　was　extracted　and　compared　with　the　possible　fault　frequency　calculated　by　the　sampling　parameters　provided　by　resampling,　so　as　to　determine　the　fault　type　of　the　planetary　gearbox.　By　analyzing　the　simulation　signal　and　the　experimental　signal　respectively,　this　method　can　find　out　the　corresponding　fault　characteristics　effectively.