Engineered　cementitious　composites　(ECCs)　have　excellent　crack　control　capacity　and　pseudo-strain-hardening　behaviour.　They　can　be　used　to　improve　the　damage-tolerant　capacity　of　vulnerable　parts　of　structures.　To　improve　the　seismic　performance　of　a　traditional　prefabricated　column　connected　with　grouted　sleeves　(GSs),　an　innovative　prefabricated　ECC　shell-reinforced　concrete　(RC)　composite　column　with　GSs　(ECC-PRC-GSs)　is　proposed　in　this　paper.　Then,　three-dimensional　nonlinear　finite　element　models　of　the　ECC-PRC-GSs　are　established　and　validated　with　previous　experimental　results.　Subsequently,　parametric　analysis　of　the　ECC-PRC-GSs　is　systematically　performed　to　assess　the　seismic　performance　of　ECC-PRC-GSs.　Notably,　certain　important　design　suggestions　for　the　ECC-PRC-GSs　are　proposed.　Finally,　a　theoretical　model　is　developed　to　predict　the　flexural　bearing　capacity　of　ECC-PRC-GSs　based　on　the　strain　compatibility　and　force　equilibrium　conditions.　The　effectiveness　of　the　model　is　verified　through　finite　element　analysis　and　experimental　results.