In　order　to　solve　the　problem　that　closed　section　columns　must　be　welded　in　the　construction　site,　a　prefabricated　steel　box　column　connection　employing　core　tube　and　double　flange　were　proposed　in　this　paper,　and　the　design　method　against　the　action　of　frequent　earthquake,　fortification　earthquake　and　rare　earthquake　was　developed.　A　5-story　prototype　structure　was　designed　and　its　substructure　with　a　scale　of　7:10　was　selected　to　conduct　pseudo　dynamic　and　quasi-static　tests,　and　the　mechanical　properties　of　the　structure,　such　as　hysteretic　behavior,　strain,　stiffness,　slippage　of　flange　plates　and　pre-tightening　force　of　bolts,　etc.,　were　studied.　The　results　from　the　pseudo　dynamic　test　show　that　the　structure　experiences　plastic　deformation　only　at　the　column　base　and　is　basically　in　the　elastic　state　for　panel　zone　and　beam　ends　under　8-degree　frequent　(0.2g),　fortification(0.2g),　and　rare(0.2g,　0.3g)　earthquakes　considering　the　El　Centro　seismic　record.　The　connections　are　reliable.　The　quasi-static　test　results　indicate　that　under　the　inter-story　drift　of　0.02　rad,　corresponding　to　the　limit　of　elastic-plastic　inter-story　drift　(1/50)　of　steel　structure,　the　hysteretic　curves　of　the　test　structure　present　a　bilinear　shape　and　a　certain　degree　of　plasticity　occurs　at　the　column　base.　The　connection　shows　obvious　rigid　connection　behavior.　The　relative　slippage　between　the　flange　plates　is　only　1.83　mm　and　the　bolt　pre-tightening　forces　show　no　loss.　The　column　connection　shows　favorable　mechanical　performance.　When　the　inter-story　drift　is　0.04　rad　(1/25),　the　hysteretic　curves　of　the　test　structure　becomes　plumper　and　the　structure　still　possesses　certain　bearing　capacity　and　stiffness.　The　relative　slippage　between　the　flange　plates　reaches　only　2.3　mm　and　there　is　basically　no　loss　of　the　bolt　pre-tightening　forces.　The　column　base　enters　plasticity,　however,　no　plasticity　is　developed　at　the　main　positions　such　as　the　panel　zone　and　the　beam　ends,　etc.　The　box　column　connection　employing　core　tube　and　double　flange　is　shown　to　be　safe　and　reliable.　The　connection　designed　by　the　proposed　design　method　meets　the　principle　of　＇strong　connection　and　weak　member＇　according　to　the　pseudo　dynamic　test　and　quasi-static　test,　and　has　achieved　the　design　purpose　of　rigid　connection.　The　plane　frame　with　box　column　connection　employing　core　tube　and　double　flange　has　the　same　mechanical　properties　as　those　of　the　rigid　frame.　Therefore,　it　can　be　calculated　as　a　rigid　connection　in　the　structural　design　process　and　applied　to　the　practical　engineering.　©　2022,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.