Abstract: AuAgCu35-5 alloy sheet was prepared through vacuum induction melting and subsequent cold forming technology. The effects of different heat treatment processes on the mechanical properties of AuAgCu35-5 alloy sheet were studied. The results show that the AuAgCu35-5 alloy sheet reaches the maximum hardness after heat treatment at 350 ℃/1 h,the hardness of 400 ℃/1 h alloy is 6.2% lower than that of the hard samples under different processing rates, and the average hardness is 201.9 HV. The stress-strain curve of tensile test at room temperature shows that the yield strength and tensile strength decrease with the increase of heat treatment temperature, and the tensile strength, yield strength and elongation at 400℃/1 h are also better. The tensile fracture surface under different heat treatment processes shows the characteristics of plastic fracture. The fracture surface at 350 ℃/1 h has the characteristics of ductile and brittle mixed fracture. The dimple at 400 ℃/1h is shallow and uniform, and the dimple is round or oval. The fracture surface is relatively flat and plastic compared with that at 300 ℃/1 h and 350 ℃/1 h.