Basing　on　the　concept　of　post-earthquake　repairability,　plastic　damage　control,　and　self-centering,　this　study　introduces　a　novel　self-centering　column　foot　joint　with　dog　bone　weakened　flange　cover　plate　(FCP)　for　prefabricated　steel　structure.　The　method　and　design　theory　for　the　target　horizontal　yield　load　and　initial　stiffness　of　the　new　joint　were　established.　Parametric　research　was　conducted　using　finite　element　simulation　to　assess　the　influence　of　the　dog　bone　weakened　FCP　thickness,　initial　cable　force,　and　axial　compression　ratio　on　the　bearing　performance　of　the　new　joint,　thereby　verifying　the　above　method　and　theory.　The　results　reveal　the　accuracy　of　the　proposed　method　for　determining　the　target　yield　load　and　initial　stiffness,　and　provide　practical　design　guidance　for　the　new　joint.　The　design　theory　values　of　the　new　joint　and　the　simulation　values　demonstrate　an　error　within　10　%,　which　satisfies　the　engineering　accuracy　requirements.　The　corresponding　procedures　and　suggestions　for　the　design　theory　of　this　new　joint　were　finally　provided.　Based　on　design　theory,　the　overall　plastic　damage　concentrates　on　the　dog　bone　weakened　FCP,　successfully　controlled　by　the　new　joint　design,　ensuring　minimal　damage　to　the　main　structure　and　demonstrating　good　bearing　capacity　and　selfcentering　performance.