The　bottom　strengthened　rectangular　concrete　filled　steel　tube　(CFST)　column　was　put　forward.　The　bottom　area　of　the　rectangular　column　was　welded　with　steel　plates　to　improve　its　seismic　energy　dissipation　capacity.　Three　1/5　scaled　column　models　with　different　construction　measures　were　tested　under　horizontal　low　cyclic　loading.　Model　1　is　a　conventional　rectangular　CFST　column;　Model　2　is　a　rectangular　CFST　column　welded　with　steel　plates　at　the　outer　bottom　part　vertical　to　the　direction　of　loading;　Model　3　is　a　rectangular　CFST　column　welded　with　steel　plates　around　lateral　side　of　the　bottom　of　the　column.　The　load　-　bearing　capacity,　stiffness　and　degradation　process,　ductility,　hysteretic　energy　dissipation　capacity　and　failure　characteristics　of　the　models　were　analyzed.　The　calculation　formula　of　load　-　bearing　capacity　of　bottom　strengthened　rectangular　CFST　column　for　normal　section　and　oblique　section　was　given,　and　the　results　agree　well　with　those　from　the　experiments.　The　study　shows　that　the　load　-　bearing　capacity,　ductility　and　seismic　energy　dissipation　capacity　of　the　bottom　strengthened　rectangular　CFST　column　are　improved　obviously　compared　with　the　conventional　rectangular　CFST　column.