Al–12Zn–3Mg–2.5Cu alloy was prepared using a liquid metallurgy route under the optimized conditions. A sample cut from the ingot was rolled non-isothermally from 400°C to 100°C in 100°C steps,with 15% reduction in thickness; it was then cold rolled isothermally at room temperature for 85% reduction. The cold-rolled alloys were characterized by electron microscopy,hardness test,and tensile test to elucidate their structural evolution and evaluate their mechanical behavior. In the results,the cast alloy consists of α-aluminum and various intermetallic compounds. These compounds are segregated along the grain boundaries,which makes the alloy difficult to roll at room temperature. The combined effect of non-isothermal step rolling and cold rolling results in the nano/microsized compounds distributed uniformly in the matrix. The hardness is substantially increased after rolling. This increase in hardness is attributed to the ultra-fine grain size,fine-scale intermetallic compounds,and structural defects(e.g.,dislocations,stacking faults,and sub-grains). The ultimate tensile strength of the rolled alloy is approximately 628 MPa with 7% ductility. A sample cut from the ingot was rolled non-isothermally from 400 ° C to 100 ° C at 100 ° C steps with 15% reduction The cold-rolled alloys were characterized by electron microscopy, hardness test, and tensile test to elucidate their structural evolution and evaluate their mechanical behavior. In the results, the The combined effect of non-isothermal step rolling and cold rolling results in the nano / microsized Compounds distributed uniformly in the matrix. The hardness is substantially increased after rolling. This increase in hardness is attributed to the ultra-fine grain size, fine-scale intermetallic compounds , and structural defects (e.g., dislocations, stacking faults, and sub-grains). The ultimate tensile strength of the rolled alloy is approximately 628 MPa with 7% ductility.