The　newest　results　about　stress-strain　relationship　of　FRP-confined　concrete　at　home　and　abroad　were　presented,　the　merits　and　drawbacks　for　these　confinement　models　were　analyzed,　and　these　confinement　models　were　verified.　Based　on　the　experimental　data　and　the　analysis　on　the　research　production,　a　constitutive　confinement　model　was　developed　for　concrete　circular　columns　confined　with　FRP.　The　feature　of　the　model　was　that　it　included　the　effects　of　FRP　confinement　on　the　concrete　microstructure　by　evaluating　the　internal　concrete　damage　using　the　axial,　lateral　and　volumetric　strains,　which　introduced　that　the　confinement　model　was　simple　and　had　a　physical　and　fundamental　interpretation　with　the　mechanical　behavior　of　concrete.　The　FRP-confined　concrete　model　predicts　accurately　the　stress-strain　relationship　of　concrete　circular　columns　confined　with　FRP　as　verified　in　comparison　with　experiments.