This　work　investigated　stress　response　of　a　corroded　X80　steel　pipeline　repaired　by　a　type-B　sleeve　to　internal　pressure　by　finite　element　modeling.　Firstly,　a　three-dimensional　numerical　model　of　corroded　pipeline　reinforced　with　type-B　sleeve　was　developed,　and　its　accuracy　and　reliability　were　verified　by　the　burst　test　results　and　the　theoretical　analytical　solution,　respectively.　Second,　the　von　Mises　stress　of　the　pipe　body,　sleeve　and　fillet　weld　was　simulated　under　various　affecting　factors,　i.e.,　internal　pressure,　corrosion　defect　dimension　(depth,　length　and　width)　and　sleeve　length.　Finally,　a　parameter　sensitivity　study　was　conducted　to　determine　the　effects　of　corrosion　geometry　and　sleeve　length　on　the　repair　efficiency.　The　main　investigation　results　show　that　the　type-B　sleeve　repair　method　is　effective　to　restore　the　pressure-bearing　capacity　of　the　pipeline　at　the　corrosion　defect,　and　the　burst　failure　of　repaired　pipeline　always　occurs　at　the　region　far　away　from　the　defect　and　sleeve.　At　the　limit　state　of　burst,　the　local　defective　region　shows　the　highest　stress,　followed　by　the　fillet　weld,　and　the　repair　sleeve　has　the　smallest　stress,　thus　the　maximum　equivalent　stress　of　the　corroded　zone　is　suggested　to　be　used　for　measuring　the　repair　efficiency　of　the　repaired　pipe　by　type-B　sleeve.　The　sleeve-repair　effectiveness　is　affected　by　depth　of　the　corrosion　defect,　a　deep　corrosion　defect　reduces　the　performance　of　the　sleeve　repair　compared　with　a　shallow　defect.　The　effect　of　the　corrosion　defect　length　on　sleeve　repair　depends　on　the　defect　depth.　Furthermore,　there　exist　a　critical　length　of　the　defect　that　affect　the　repair　efficiency.　The　corrosion　defect　width　shows　limited　effect　on　stress　level　at　the　defect　of　the　repaired　pipe.　At　last,　a　new　method　based　on　stress　analysis　is　proposed　to　optimize　the　sleeve　length　for　repairing　a　corroded　pipeline.