Experiments　on　CFST　arch　and　hybrid　arch　of　steel　tube　and　CFST　under　unsymmetrical　two　concentrically　in-plane　loads　were　carried　out.　The　deflections,　strains　of　steel　tube,　effect　of　material　non-linearity,　geometrical　non-linearity　and　the　effect　of　filled　concrete　to　the　ultimate　load-carrying　capacity　of　tubular　arch　were　analyzed.　The　analytical　results　showed　that　the　promotion　effect　of　the　filled　concrete　on　the　ultimate　load-carrying　capacity　of　tubular　arch　is　closely　related　to　the　loading　cases.　When　the　loads　produce　bending　moments　as　the　dominant　forces　in　the　arch,　the　promotion　effect　is　rather　small;　however,　when　the　loads　produce　axial　compressive　forces　as　the　dominant　ones,　the　promotion　effect　becomes　large.　In　the　whole　process　of　the　tubular　arches,　the　effect　of　material　non-linearity　is　more　important　than　that　of　geometrical　non-linearity.　If　both　nonlinearities　are　present,　they　should　be　considered　all　together,　since　the　effects　are　compounded.　For　a　hybrid　arch,　the　behavior　of　the　hollow　steel　tubular　rib　near　the　end　of　the　CFST　arch　rib　is　quite　complex.