This　paper　examines　the　fatigue　behavior　of　steel/glass　fiber　reinforced　polymer　(GFRP)　double-strap　joints　under　a　variation　of　cyclic　shear　loading　at　different　given　temperatures.　Initial　experiments　were　performed　at　a　constant　amplitude　force,　which　demonstrated　a　reduction　in　fatigue　strength　at　increasing　temperatures.　The　results　were　used　for　cumulative　relative　damage　calculation　purposes.　Subsequent　tests　were　then　performed　under　two-stress　level　fatigue　(TSLF)　tests　with　a　given　temperature.　The　TSLF　tests　demonstrated　the　following:　(1)　relative　to　results　at　20　degrees　C,　the　damage　was　retarded　at　lower　temperatures　(-10　degrees　C　and　0　degrees　C),　and　the　damage　accelerated　at　higher　temperatures　(40　degrees　C);　and　(2)　linear　damage　accumulation　models,　such　as　the　Palmgren-Miner　model,　are　not　appropriate　and　tend　to　overpredict　fatigue　life.　By　using　the　nonlinear　strength　wearout　and　linear　cycle　mix　models　for　bonded　joints,　an　improved　prediction　method　is　proposed,　and　the　fatigue　results　of　the　TSLF　tests　were　discussed　in　which　it　was　found　that　the　proposed　method　can　accurately　predict　the　fatigue　lifetime.