The　electrochemical　accelerated　corrosion　of　reinforced　concrete　(RC)　columns　was　carried　out　with　the　target　corrosion　rate　of　longitudinal　rebar　as　15%,　then　the　magnesium　phosphate　cement　(MPC)-carbon　fiber　reinforced　plastics　(CFRP)　as　strengthening　approach　and　electrochemical　chloride　extraction　(ECE)　method　were　integrated　to　process　the　RC　columns.　Among　them,　when　the　dechlorination　period　was　35d,　the　current　density　of　dechlorination　was　selected　as　1　A/m(2),　2　A/m(2),　and　3　A/m(2);　when　the　periods　of　dechlorination　were　21d,　35d　and　49d　respectively,　the　dechlorination　current　density　was　set　as　2　A/m(2).　Finally,　the　seismic　performance　and　dechlorination　efficiency　of　RC　columns　under　different　dechlorination　current　densities　and　dechlorination　periods　were　mainly　analyzed　by　failure　mode,　hysteresis　performance,　lateral　strength,　ductility　performance,　stiffness　degradation,　residual　deformation　plus　energy　dissipation.　Compared　with　the　corroded　RC　columns,　the　cumulative　energy　dissipation　capacity　of　the　RC　columns　enhanced　by　MPC-CFRP　promoted　by　101.33%　-206.36%.　When　the　dechlorination　period　was　35d,　the　seismic　performance　of　the　RC　columns　dechlorided　by　the　current　density　of　1　A/m(2)　and　2　A/m(2)　did　not　decrease　significantly,　and　the　seismic　performance　of　RC　columns　with　the　dechlorination　current　density　of　3　A/m(2)　greatly　reduced.　When　2　A/m(2)　was　regarded　as　the　dechlorination　current　density,　the　seismic　performance　of　concrete　columns　with　the　dechlorination　periods　of　21d　and　35d　did　not　decrease　significantly,　and　the　seismic　performance　of　the　concrete　columns　with　the　dechlorination　periods　of　49d　greatly　reduced.　However,　it　was　worth　noting　that　the　chloride　ion　content　of　the　interface　between　rebar　and　concrete　abated　significantly　with　the　growth　of　the　current　density　and　the　dechlorination　period.