Fracture　evaluation　of　three　dimensional　(3D)　notches　in　creeping　solids　have　drawn　considerable　attention　due　to　their　potential　application　in　structural　integrity　assessment.　In　this　paper,　the　notch　stress　intensity　factor　(NSIF)　and　the　strain　energy　rate　density　(SERD)　rule　are　extended　to　3D　sharp　V-notch　tip　under　creeping　conditions.　In　particular,　the　out-of-plane　factor　Tz　is　introduced　to　describe　the　3D　NSIF　of　creeping　sharp　V-notch　tip　field.　The　out-of-plane　effect　on　the　SERD　is　also　studied　based　on　the　KN(t)-Tz　solution.　A　method　to　evaluate　the　3D　sharp　V-notch　NSIF　was　proposed　based　on　the　concept　of　SERD.　The　link　between　the　NISF　and　SERD　of　3D　sharp　V-notch　is　established　and　discussed.　It　is　found　that　the　SERD　is　obviously　influenced　by　the　out-of-plane　factor.　The　variations　of　NSIF　along　the　thickness　direction　of　3D　sharp　V-notch　front　and　the　effect　of　creep　time　are　also　discussed.　The　accuracy　of　the　presented　evaluation　form　is　also　validated.　The　solution　given　in　this　paper　could　provide　a　new　perspective　and　theoretical　foundation　on　understanding　the　NSIF　and　SERD　for　sharp　V-notch.　©　2022　Elsevier　Ltd