The　in-plane　whole　critical　load　of　CFST　latticed　columns　under　eccentric　compression　is　calculated　with　design　criterion　(CECS28:90)　for　CFST　structure.　In　this　criterion,　equivalent　slenderness　ratio　of　latticed　column　is　calculated　by　an　addition　method　and　the　shearing　influence　will　be　overestimated　for　those　members　with　small　slenderness　ratio,　so　there　is　big　difference　between　the　calculation　results　and　the　test　results.　A　method　by　using　an　enlarging　parameter　to　calculate　equivalent　slenderness　ratio　of　CFST　latticed　columns　is　presented.　The　calculation　results　critical　load　by　this　method　are　coincident　well　with　the　test　results.