Five　full-scale　RC　frame　joints　with　the　same　reinforcement　were　designed　to　study　the　effects　of　corrosive　cracks　due　to　marine　environment　on　the　fire　resistance　performance　of　RC　frame　joints.　Four　joints　were　designed　to　produce　corrosive　cracks　of　different　widths　along　the　stirrups　by　electrochemistry　accelerated　corrosion　test　to　simulate　marine　environment.　The　maximum　width　was　set　as　the　damage　index.　One　joint　was　the　contrast.　Then　fire　tests　were　carried　out　until　the　joints　were　damaged.　The　results　show　that　the　transverse　cracks　induced　by　the　electrochemistry　accelerated　corrosion　test　are　along　the　stirrups.　The　separation　of　the　transverse　cracks　is　similar　to　that　of　the　stirrups.　The　initial　crack　width　has　a　significant　effect　on　the　deformation　incremental　rate　of　the　ends　of　beams　and　columns,　which　will　change　more　rapidly　with　the　enlargement　of　the　width　at　high　temperature.　Cracks　can　accelerate　the　heat　transfer,　leading　to　the　distortion　of　temperature　field.　The　presence　of　cracks　can　affect　the　heating　rate　of　steel　bars　and　concrete,　and　the　bearing　capacity　of　joints　with　corrosion　cracks　decrease　significantly　after　fire.　©　2016,　Science　Press.　All　right　reserved.