Special-shaped　multicell　composite　concrete-filled　steel　tube　(CFT)　columns　have　been　used　in　several　super-high-rise　buildings.　However,　research　on　special-shaped　multicell　CFT　columns　under　low　cyclic　loading　remains　limited.　Thus,　seven　1/30-scaled　specimens　were　designed　for　a　low　cyclic　loading　test.　The　parameters　are　four　cross-section　structures　(i.e.,　the　basic　type,　angle　steel　reinforced　type,　circular　steel　tube　reinforced　type,　and　simplified　type)　and　three　loading　directions　(i.e.,　the　long　axis,　short　axis,　and　45　degrees).　The　failure　modes,　hysteretic　behavior,　bearing　capacity,　ductility,　and　energy-dissipation　capacity　were　analyzed.　The　results　show　that　the　angle　steel　and　circular　steel　tube　significantly　increase　the　bearing　capacity　and　energy　dissipation.　The　circular　steel　tube　has　a　better　effect　than　the　angle　steel.　The　bearing　capacity　of　the　simplified-type　specimens　decreases　but　the　ductility　increases.　When　the　loading　direction　changes　from　the　long　axis　to　the　short　axis,　the　ductility　gradually　increases,　whereas　the　bearing　capacity　and　energy-dissipation　capacity　gradually　decrease.　The　optimized　models　of　the　fiber-based　method　(FBM)　were　proposed　to　predict　the　N-M　curves　and　F-Delta　curves.　The　concrete　constitutive　relationship　in　the　multicell　CFT　was　proposed　based　on　the　separation　model　by　analyzing　the　features　of　multicell　CFT　columns　and　was　used　in　the　optimized　fiber-based　method.　The　numerical　simulation　models　were　established　using　Abaqus　to　simulate　the　F-Delta　curves　for　FBM　models　and　test.　The　calculation　results　show　good　consistency　with　the　test.　(C)　2019　American　Society　of　Civil　Engineers.