A　composite　shear　wall　with　concrete　filled　steel　tube　(CFST)　boundary　columns　and　embedded　steel　plates　was　proposed.　The　test　shows　it　has　good　seismic　behavior.　In　order　to　investigate　its　stress　characteristic,　the　plane　cross-section　assumption　was　introduced　based　on　the　test　study.　The　simplified　calculation　model　for　the　normal　section　flexural　load-bearing　capacity　was　put　forward.　The　formulae　of　stripe　method　were　given　and　the　corresponding　calculation　program　was　complied.　The　effect　of　the　thickness　of　steel　tube,　thickness　of　the　embedded　steel　plate　and　the　concrete　strength　on　the　flexural　load-bearing　capacity　was　discussed.　The　calculated　results　are　in　good　agreement　with　the　test　results.　Results　show　that:　the　flexural　load-bearing　capacity　is　improved　greatly　with　the　increasing　of　the　thickness　of　steel　tube;　the　load-bearing　capacity　is　improved　with　the　increasing　of　the　thickness　of　steel　plate,　but　it　has　lower　efficiency　than　increasing　the　thickness　of　steel　tube;　the　flexural　load-bearing　capacity　is　improved　marginally　with　the　increasing　of　concrete　strength,　but　the　increasing　amplitude　decreases　with　the　increasing　of　steel　tube　thickness;　the　parameters,　such　as　the　thickness　of　steel　tube,　thickness　of　embedded　steel　plate,　the　thickness　of　wall　and　concrete　strength,　should　be　set　optimally　so　as　to　give　full　play　to　the　seismic　efficiency　of　composite　shear　wall.