Annealing treatment is an effective method for improving structural stability of ultrafine-grained (UFG) or nanostructured (NS) materials produced by severe plastic deformation (SPD). This work focuses on the effect of annealing temperature on the tensile fracture behavior of UFG Cu produced by accumulative roll bonding (ARB). Annealing treatment was performed for 10 min at temperatures of 100, 150, 200 and 250 ℃. The microstructure of annealed and ARBed UFG Cu was observed by TEM. The uniaxial static tensile test was performed by utilizing fatigue testing machine (IBTC-5000) with an initial strain rate of 10-2 s-1. Fracture morphology was observed by SEM. The results suggested that yield strength and tensile strength decreased after annealing treatment compared with initial sample. However, yield strength and tensile strength of ARB-Cu increased with increasing annealing temperature below recrystallization temperature. When annealing temperature is higher than recrystallization temperature, the strength decreased rapidly. With increasing the annealing temperature, the grain size of ARB-Cu increases and gradually tends to bimodal distribution, and the fracture morphology shows a trend of increasing plasticity gradually. The annealing treatment is helpful to bonding efficiency E. The relationship between the theoretical bonding efficiency E and the ARB passes n can be expressed in E=(1-0.5n)×100%.