The　beam-to-column　joint　rotation　influences　the　internal　force　and　deformation　of　steel　frames,　thus　influences　the　design　of　the　beam　and　column　members.　Because　of　the　differences　in　research　conditions　and　research　methods,　many　researchers　use　their　own　definitions　and　methods　for　the　calculation　of　beam-to-column　joint　rotation　in　steel　frames,　which　results　in　some　unknown　errors　due　to　the　introduction　of　the　beam　and　column　deformation,　as　a　result,　some　achieved　research　results　can　not　be　referred.　This　paper　compares　and　analyzes　some　definitions　and　measuring　calculation　methods　for　beam-to-column　joint　rotation　in　steel　frames　currently　used　in　China　and　other　countries,　proposes　the　improved　measuring　calculation　method　for　welded　joint　rotation　and　welded-flange-bolted-web　joint　rotation,　and　verifies　its　accuracy　and　feasibility;　then　combines　the　measuring　calculation　method　of　joint　rotation　and　uses　the　suitable　joint　simplified　theoretical　model　to　carry　out　the　global　analysis,　and　discusses　its　accuracy.　The　results　of　the　finite　element　analysis　show　that　the　three　proposed　measuring　calculation　methods　of　joint　rotation　have　high　precision,　and　the　simplified　model　of　the　global　frame,　which　incorporates　the　panel　zone　diagonal　spring,　not　only　considers　the　influence　of　joint　rotation,　but　also　has　high　accuracy.