As　one　of　the　most　important　topics　studied　in　creep　fracture　mechanics,　mechanics　fields　at　3D　sharp　V-notch　front　tip　in　creeping　solids　have　drawn　remarkable　attention　at　present.　In　this　paper,　the　higher-order　asymptotic　analysis　is　carried　out　for　3D　sharp　V-notch　front　tip　fields　in　creeping　solids　subjected　to　mode　I　loading,　and　a　3D　higher-order　term　solution　is　theoretically　proposed　by　introducing　the　out-of-plane　stress　factor　Tz　to　establish　the　3D　nonlinear　governing　equations　of　front　tip　fields.　The　present　higher-order　asymptotic　solution　for　3D　sharp　V-notch　can　naturally　be　degenerated　to　that　for　3D　crack.　It　is　found　that　the　stress　exponents　and　angular　distribution　functions　of　higher-order　terms　for　3D　notch　and　crack　are　highly　related　to　Tz.　The　proposed　3D　higher-order　term　solution　overall　shows　better　agreement　with　the　FEA　results　than　the　existing　3D　leading-term　solution　and　2D　higher-order　term　solutions　available　in　the　literature,　especially　for　smaller　notch　angle　and　shorter　ligament　lengths.　Based　on　the　3D　higherorder　asymptotic　solution,　a　new　fracture　parameter　AT2　is　given　and　combined　with　Tz　to　characterize　3D　constraint　effect.　It　is　noted　that　the　effects　of　AT2　and　Tz　on　3D　constraint　are　highly　interlinked　rather　than　simply　separated　into　in-plane　and　out-of-plane　parts.　The　present　3D　higher-order　asymptotic　solution　can　promote　the　understanding　and　characterization　of　3D　constraint　effect　and　is　of　great　significance　in　the　evaluation　of　3D　fracture　behavior　and　structural　failure　assessment　under　creep　conditions.