Combined　with　the　design　requirement　of　mega　column　frame　in　super　high　rise　buildings,　six　hexagonal　CFT　mega　column　specimens　with　six　cavities　were　tested　under　low　cyclic　loading.　In　the　test,　the　load　case　that　compressive　and　tensile　stresses　alternately　appeared　under　major　earthquakes　was　considered;　also　the　horizontal　earthquake　action　direction　was　taken　into　account.　The　specimens　were　loaded　along　long　axis　direction,　short　axis　direction　and　45　degree　direction,　and　the　modeling　scale　was　1/25.Failure　patterns,　hysteretic　behavior,　skeleton　curves,　bearing　capacity,　stiffness　degradation,　ductility,　energy　dissipating　capacity　and　strain　of　the　six　specimens　were　analyzed.　FEA　model　was　established　and　simulation　was　conducted　through　ABAQUS　software.　Research　shows　that　special-shaped　CFT　mega　columns　with　multiple　cavities　have　higher　bearing　capacity　by　29.4%　averagely　and　stronger　energy　dissipating　capacity　by　6.8%　averagely　in　long　axis　direction　than　in　other　directions;　the　seismic　behavior　of　the　specimens　loaded　along　the　45　degree　direction　is　lower　than　that　loaded　along　the　long　axis　direction　and　higher　than　that　loaded　along　the　short　axis　direction;　compared　with　the　specimens　under　axial　compressive　force,　the　bearing　capacity　of　the　specimens　under　tensile　force　decreases　by　8.4%　averagely,　and　the　energy　dissipating　capacity　decreases　by　16.1%　averagely;　the　average　value　of　yielding　drift　ratio　of　the　six　specimens　is　1/82　and　that　of　maximum　elasto-plastic　drift　ratio　is　1/18,　indicating　the　deformation　capacity　is　good;　the　FEA　model　can　well　simulate　the　loading　process.　©,　2015,　Science　Press.　All　right　reserved.