Based　on　the　cyclic　loading　of　four　concrete-filled　steel　tube　(CFST)　column-to-beam　joints　implanted　by　steel　rebars,　the　paper　studies　the　effects　of　different　sectional　sizes　of　middle　columns　and　the　configuration　of　transfer　sleeve　on　the　connection　behavior.　The　failure　mode,　hysteretic　behavior,　skeleton　curve,　stiffness　degradation,　bearing　capacity　degradation,　energy　dissipation　capacity,　and　strain　distribution　of　all　specimens　were　analyzed.　The　results　showed　that　the　plastic　deformation　was　mainly　concentrated　at　the　column-column　connections,　especially　at　the　upper-middle　column　connection.　The　cross-sectional　dimensions　of　the　middle　column　had　a　slight　effect　on　the　bending　capacity　of　the　connection,　while　the　transfer　sleeve　enhanced　on　it.　The　outer　annular　stiffeners　and　webs　bolted　with　the　steel　beam　had　limited　contribution　to　the　deformation　of　column-to-beam　joints.