Only　bending　moment　and　shear　force　at　beam　end　are　commonly　considered　in　designing　beam-to-column　connections.　However,　axial　force　at　beam　end　has　to　be　taken　into　account　in　some　cases.　Four　flush　endplate　composite　connections　between　steel-concrete　beam　and　steel　column　were　designed,　fabricated,　and　tested.　The　specimens　were　subjected　to　reverse　bending　under　separately　no　axial　force,　10%　of　Nby　tension　force,　20%　of　Nby　tension　force　and　10%　of　Nby　compression　force　at　beam　end.　The　seismic　behaviors,　such　as　stiffness,　bearing　capacity,　ductility,　hysteretic　behavior,　energy　dissipation　capacity　and　failure　modes,　etc.,　were　studied.　The　results　indicate　that　beam　end　axial　tension　force　can　intensify　the　deformation　and　damage　of　the　specimens,　and　reduce　the　bearing　capacity,　stiffness　and　energy　dissipation　capacity　and　so　on;　however,　the　compressive　force　can　delay　the　deformation　and　damage　of　connections　in　early　stage,　and　accelerates　the　damage　of　specimen　as　the　deformation　increasing;　regardless　of　the　beam　end　force　is　axial　tension　or　compression,　the　ductility　of　the　specimens　are　significantly　decreased,　and　the　total　energy　dissipation　capacity　declines.