The　steel　tube　of　Concrete　Filled　Steel　Tubular　(CFST)　structure　will　produce　initial　stress　while　in　the　processing　of　construction.　Total　of　4　CFST　single　circular　solid　arches　under　in-plane　dissymmetrical　loads　are　tested.　The　results　indicate　that　the　CFST　solid　arches　have　much　the　same　load-displacements　configuration　and　load-strains　distributed　disciplinarian　with　or　without　initial　stress　when　subject　to　dissymmetrical　vertical　load.　Vertical　displacement　is　dissymmetry　and　horizontal　deformation　is　toward　to　the　arch　springs　of　non-loading.　The　position　of　up　and　below　border　close　to　the　loading　region　is　compressive　and　tensile　stress　respectively,　and　reverses　on　corresponding　to　the　area　of　symmetry.　The　presence　of　initial　stress　of　CFST　columns　makes　the　compressive　stress　increasing,　which　leads　to　the　phase　of　elastic-plastic　appear　ahead　and　yield　earlier　and　fail.　With　the　increasing　of　initial　stress　degree,　the　ultimate　load　carrying　capacity　of　CFST　single　circular　tube　solid　arch　decreases.