Based　on　the　cyclic　testing　and　finite　element　model　updating,　the　parametric　analysis　of　two　kinds　of　concrete-filled　square　steel　tubular　column-to-steel　beam　semi-rigid　connections,　namely　sided-plate　welding　(SPW)　connection　and　stiffened　end　plate　(SEP)　connection,　under　the　cyclic　loading　by　using　the　ANSYS　program　was　conducted.　From　the　analysis,　it　can　be　seen　that　the　main　influenctial　factor　of　the　SPW　connection　is　the　thickness　of　sided-plate,　and　those　of　SEP　connection　are　the　diameters　of　bolts　and　the　thickness　of　end-plate.　Furthermore,　restoring-force　constitutive　models　for　the　monotonic　moment-rotation　relationships　of　two　kinds　of　connections　were　established　through　statistic　regressing　analysis.　These　models　can　be　used　to　the　initial　design　of　the　practical　engineering　and　the　numerical　analysis.