In　order　to　study　the　influence　of　the　initial　stress　on　the　mechanical　performance　of　concrete　filled　steel　tubular　(CFST)　latticed　columns,　axial　loading　test　of　CFST　latticed　columns　with　initial　stress　was　conducted.　The　test　setup　for　applying　initial　stress,　the　curves　of　load　vs.　deformation　as　well　as　the　hooping　effect　were　analyzed.　The　results　indicate　that　the　CFST　columns　with　initial　stress　have　smaller　combined　stiffness　and　ultimate　load-carrying　capacity　as　compared　with　CFST　columns　without　initial　stress.　Furthermore,　the　presence　of　initial　stress　will　advance　the　coming　of　plastic　phase,　delay　the　appearance　of　hooping　effect　and　weaken　its　benefit,　which　decreases　the　ultimate　load-carrying　capacity.　Nevertheless,　the　mechanical　behavior　of　lacing　tubes　doesn＇t　vary　with　the　initial　stress　and　all　the　lacing　tubes　are　in　the　elastic　phase　during　the　testing.