To　study　the　seismic　performance　of　the　post-tensioned　precast　RC　beam-column　joints　with　additional　curved　steel　braces,　joint　specimens　braced　by　curved　steel　plates　with　different　cross　section　widths　and　eccentricities　and　joint　specimens　without　brace　were　tested　under　reversed　cyclic　loads.　The　parametric　analysis　was　carried　out　using　the　FEA　model.　The　failure　mode,　bearing　capacity,　stiffness　and　energy　dissipation,　etc.　were　analyzed.　The　results　show　that　the　whole　joints　have　stable　mechanical　behavior　with　inter-story　drift　angle　up　to　5%,　when　concrete　crushing　at　the　end　of　the　beam　and　curved　braces　yielding　under　bending.　The　curved　steel　brace　can　improve　the　bearing　capacity,　stiffness　and　energy　dissipating　capacity　of　the　precast　joints.　The　bearing　capacity,　stiffness　and　energy　dissipating　capacity　of　joints　increase　gradually　with　the　increase　of　brace　section　width　and　the　decrease　of　brace　eccentricity.　The　equivalent　viscous　damping　coefficient　at　inter-story　drift　angle　of　4%　is　about　0.12　to　0.20,　which　is　two　to　three　times　higher　than　that　of　the　general　post-tensioned　precast　RC　joints.　When　the　eccentricity　of　the　curve　steel　brace　is　less　than　0.3,　the　resistance　of　the　joint　is　greatly　influenced　by　the　eccentricity.　However,　the　resistance　of　the　joint　is　slightly　influenced　by　the　eccentricity　when　it　is　greater　than　0.3.　©　2020,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.