Pre　-tensioned　steel　cable　is　a　crucial　load　-bearing　component　of　steel　structure,　the　fire　behavior　of　which　affects　the　overall　performance　of　the　structure.　However,　it　presently　lacks　research　and　fire　safety　design　method　to　consider　steel　cable　members　subject　to　localized　large　-space　building　fire.　In　this　paper,　the　mechanical　behavior　of　normal　steel　strand　cable　and　full　-locked　steel　cable　under　large　-space　building　fire　is　investigated,　to　provide　guidance　for　the　fire　safety　design　of　steel　cable.　Firstly,　the　numerical　model　of　temperature　field　of　steel　cables　subject　to　large　-space　building　fire　was　established　and　verified　with　the　test　results.　Secondly,　based　on　the　verified　temperature　field　model,　the　sequential　therm　almechanical　coupling　numerical　model　was　established　to　study　the　fire　behavior　of　steel　cable,　including　temperature　field,　temperature　gradient,　failure　mechanism,　internal　force　and　contact　stress.　Thirdly,　the　numerical　method　was　adopted　for　the　parametric　analysis　on　the　fire　resistance　of　steel　cables,　considering　the　effect　of　temperature　-field　model,　non　-uniform　fire,　load　ratio　and　span　of　steel　cable.　The　following　conclusions　are　obtained:　1)　The　average　temperature　can　be　taken　to　simplify　the　transverse　temperature　field　due　to　the　small　amplitude　of　transverse　temperature　gradient　of　steel　cable　section;　2)　Because　of　the　size　effect　of　steel　wire,　the　overall　temperature　of　normal　steel　strand　cable　is　higher　than　that　of　fulllocked　steel　cable　under　the　same　conditions　of　same　nominal　diameter　and　fire　conditions,　and　the　damage　occurs　earlier　than　that　of　full　-locked　steel　cable　under　fire.