In　order　to　investigate　the　size　effect　and　other　effects　on　the　stress-strain　relationship　of　confined　concrete,　42　specimens　with　different　sizes　and　section　shapes　were　placed　under　axial　compression　loading.　Effects　of　key　parameters　such　as　size　of　specimens,　tie　configuration,　transverse　reinforcement　ratio,　and　concrete　cover　were　studied.　The　results　show　that　for　specimens　with　the　same　configuration　and　the　same　volumetric　ratio　of　the　transverse　reinforcement,　along　with　the　increasing　specimen　size,　the　peak　stress,　peak　strain　and　deformation　of　the　post-peak　show　a　down　trend,　however,　the　volumetric　ratio　of　the　transverse　reinforcement　is　lowered,　the　decreasing　of　the　peak　stress　is　accelerated,　but　the　decreasing　of　the　deformation　is　slow　down.　For　specimens　with　the　same　volumetric　ratio　but　different　configurations　of　transverse　reinforcement,　though　the　transverse　reinforcement　configuration　becomes　more　complicated,　the　peak　stress　of　the　large　size　specimen　does　not　improve　more　than　that　of　the　small　size.　However,　the　deformation　occurs　before　the　stress　declines　to　85%　of　peak　stress,　and　the　improvement　with　the　grid　pattern　tie　configuration　is　much　greater　due　to　size　effect.