Abstract: Aiming at the shortcoming that it is difficult for a single curing agent to simultaneously meet the requirements of heat resistance and toughness, the influence of the mixing of two curing agents (Condensationamine 105 with excellent heat resistance and amino-terminated polyoxypropylene D230 with good toughness) on the glass transition temperature T_g and basic mechanical properties of the nano-SiO₂ epoxy adhesive at elevated temperature was analyzed. According to certain curing conditions, a total of 30 adhesive tensile test pieces and 21 carbon fiber reinforced polymer (CFRP) plate-steel double lap test pieces were fabricated, and quasi-static tensile tests and shear tensile tests were performed at elevated and room temperatures. The dynamic thermodynamic properties of the corresponding adhesives were tested and compared with the heat resistance and mechanical properties of commonly used commercial adhesives. The results show that the preferred ratio of the two curing agents of condensationamine 105 and amino-terminated polyoxypropylene D230 is 1∶2. With the increase of the curing temperature, the T_g of the adhesive with the preferred ratio of two mixed curing agent is increased. Based on comprehensive technical and economic factors, the recommended (preferred) curing condition is 90℃ for 2 h. The tensile strength and toughness of the nano-SiO₂ epoxy adhesive with the recommended ratio and the recommended curing conditions between ambient temperature 20~70℃ are better than the commonly used commercial adhesives. The load-displacement curve of CFRP plate-steel lap joint based on nano-SiO₂ adhesive with recommended ratio and recommended curing process has a yield section at the service temperature of 70℃, and the bearing capacity (Compared with the lap joint based on nano-SiO₂ adhesive with a single condensationamine 105 and a single amino-terminated polyoxypropylene 230 curing agent, the bearing capacity of the lap joint has been increased by 104.03% and 64.43%, respectively) and ductility (It is more than 2.5 times of the lap joints using a single amine 105 curing agent) are greatly improved. The bond-slip constitutive can be simplified as a trilinear quadrilateral model at elevated temperature and room temperature. Under the premise of satisfying heat resistance, the toughness of the adhesive needs to be improved as much as possible to effectively enhance the bonded behavior of the CFRP-steel lap interface. The recommended adhesive-bonded CFRP plate-steel lap joint has much superior load-bearing capacity and interface fracture energy compared with commonly used commercial adhesives.