Silicon　carbide　fiber　reinforced　silicon　carbide　matrix(SiCf/SiC)composite　is　the　key　cladding　material　of　nuclear　fuel,which　determines　the　safety　and　reliability　of　nuclear　fuel　storage　and　transportation.The　replacement　of　its　storage　and　transportation　scenario　needs　to　be　completed　by　the　manipulator,but　the　application　of　SiCf/SiC　wear,fracture,and　nuclear　leakage　in　the　snatching　process　of　brittle-flexible-rigid　contact　in　the　irradiation　environment　has　been　seriously　restricted　due　to　unclear　understanding　of　the　damage　mechanism.Therefore,the　effects　of　irradiation　dose　and　clamping　load　on　the　friction　characteristics　of　the　contact　interface　between　SiCf/SiC　clad　tube　are　studied　in　this　paper,and　the　effects　of　irradiation　parameters　and　clamping　force　on　the　static　friction　coefficient　of　the　contact　interface　between　the　clad　tube　and　flexible　nitrile　are　obtained.Based　on　the　Greenwood-Williamson　tribological　model,a　numerical　model　of　the　shape　and　structure　of　the　contact　micro-convex　at　the　micro-scale　of　the　clamping　interface　is　constructed　by　introducing　the　multi-surface　integral,and　finally　verified　by　experiments.The　research　results　show　that　there　is　a　unique＂irradiation　suppression　zone＂under　the　clamping　condition　of　SiCf/SiC　cladding　tube　under　the　nuclear　irradiation　environment,and　the　growth　of　static　friction　coefficient　slows　down　until　stagnates　after　irradiation　reaches　a　certain　extent(600　kGy),and　there　will　be　a　decline　when　the　irradiation　dose　continues　to　increase,among　which　the　clamping　force　of　15.2　N　within　the　irradiation　interval　of　1,000　kGy　can　meet　the　safety　of　nuclear　environment　operation.The　results　of　this　paper　can　provide　an　important　theoretical　basis　and　application　guidance　for　the　safe　operation　of　SiCf/SiC　cladding　tubes　in　the　storage　and　transportation　clamping　process.