By　employing　component　method,　an　analytical　model　to　predict　the　initial　rotational　stiffness　of　steel　beam-to-column　end-plate　connections　is　set　up.　It　is　considered　that　the　connection　rotation　is　mainly　induced　by　the　deformation　of　the　end-plate　in　bending,　flange　in　bending,　bolts　in　tension,　column　web　in　shear,　column　web　in　compression　and　column　web　in　tension.　The　deformations　of　the　end-plate　and　column　flange　in　bending　are　estimated　in　plate-shell　theory.　Explicit　formulae　of　stiffness　are　obtained　for　the　end-plate　and　column　flange　with　different　stiffer　configuration.　The　effective　width　used　for　the　stiffness　calculation　is　unified　with　that　for　the　strength　calculation　suggested　by　EC3.　When　the　stiffness　of　bolts　in　tension　is　calculated,　the　effects　of　connected　plates　under　pre-compression　on　the　deformation　of　bolts　are　taken　into　account.　The　comparison　between　the　model　and　test　results,　other　models,　shows　that　the　model　is　rational　and　more　accurate.　Moreover,　the　calculation　process　of　the　model　is　simple.　Thusly　it　can　be　used　in　practical　design.