The　seismic　behavior　of　the　beam-column　connections　in　concrete　frame　is　studied　in　this　paper,　including　five　precast　specimens　and　one　cast-in-place　specimen.　For　the　precast　specimens,　the　column,　joint　and　part　of　the　beam　away　from　the　joint　are　prefabricated,　while　the　part　of　beam　close　to　the　joint　is　cast-in-place.　The　rebar　is　connected　by　grout　sleeve.　The　specimens　were　tested　under　low-reversed　cyclic　loading,　and　were　evaluated　in　terms　of　failure　mode,　skeleton　curves,　stiffness,　energy　dissipation,　and　drift　capacity.　Differences　in　seismic　performance　between　these　specimens　were　also　revealed.　From　the　test　results,　the　seismic　performance　of　the　precast　connection　is　similar　to　that　of　the　cast　in-place　connection.　However,　the　distribution　of　cracks,　the　strain　of　reinforcements　and　the　deformation　of　joint　are　different.　The　strength　ratio　between　column　and　beam　is　an　important　factor　on　the　failure　mode　of　the　precast　connections.　For　precast　connection,　the　seismic　behavior　of　the　plastic　hinge　as　well　as　the　core　region　of　the　joint　are　clearly　affected　by　the　grout　sleeve,　the　cast-in-place　region　and　the　rebar　hole.　Also　in　the　core　region　of　the　joint,　slippage　of　longitudinal　rebar　is　observed.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.