Abstract: According to the phenomenon that the temperature of the steel bridge deck reached about 60℃ in summer, and significantly affect the mechanical properties of the bonding interface of carbon fiber reinforced composite (CFRP)-reinforced steel structure, a total of 21 adhesive tensile test pieces and 15 CFRP plate-steel double-lap joints were fabricated, and quasi-static tensile tests and shear tests at different ambient temperatures were performed, based on developed high-performance adhesive GY34. The influence of high temperature (≤90℃) on the mechanical properties of adhesive and the mechanical properties of bonded CFRP plate-steel lap joints was obtained. A prediction model for the bearing capacity of the lap joint interface considering the effect of tempera-ture was established, and the trend of the bond-slip relationship model with the increasing of the temperature was obtained. The results show that the tensile strength and elastic modulus of the adhesive GY34 gradually decreases, and the elongation at break and the strain energy first increase and then decrease with the increasing of tempera-ture, and reaching a peak when the temperature is close to the glass transition temperature T_g,S of the adhesive. With the increase of temperature, the bearing capacity of CFRP-steel lap joints based on the developed adhesive first increases and then decreases, and the failure mode gradually transits from CFRP plate delamination to steel adhesive interface failure. The load-displacement curve has a significant ductile development stage at high tempera-ture below the T_g,S of the adhesive. With the increase of temperature, the strain distribution of lap joints becomes more uniform, and the shear stress transfer range and the effective bonding length increase significantly. The shapes of bond-slip relationship model of lap joints based on the developed adhesives are trilinear trapezoids at different temperatures. The shape of the bond-slip relationship model remains constant at high temperature, but the maximum shear stress and stiffness gradually decrease, and the relative slip and interface fracture energy first increase and then decrease with the increasing of temperature.