The　existing　constitutive　model　of　confined　concrete　is　not　established　on　the　direct　test　data,which　needs　to　be　verified　and　modified.In　order　to　accurately　measure　the　internal　stress　of　confined　concrete,a　miniature　large　range　earth　pressure　box　is　developed.The　internal　strain　of　concrete　is　measured　by　the　strain　gauges　embedded　in　a　resin　rod.The　relevant　sensors　are　embedded　in　different　positions　inside　the　reinforced　concrete　prismatic　specimens,and　finally　the　axial　compression　test　is　carried　out　to　obtain　the　real　stress-strain　data　of　the　confined　concrete.The　stress-strain　data　at　different　positions　in　the　confined　concrete　are　comprehensively　processed　to　obtain　the　equivalent　stress-strain　curve,and　then　the　traditional　constitutive　model　of　confined　concrete　is　modified.Through　the　finite　element　simulation　analysis　of　the　specimen,　the　accuracy　of　the　modified　constrained　concrete　constitutive　model　is　preliminarily　verified.　The　accuracy　of　the　modified　constitutive　model　and　the　test　technique　is　further　verified　by　the　static　loading　failure　test　data　and　finite　element　simulation　of　reinforced　concrete　columns.　©　2024　Editorial　Board　of　Journal　of　Basic　Science　and　Engineering.　All　rights　reserved.