The effects of high-temperature treatment （HTT） processes with different parameters on the corrosion resistance of high-alloyed AlZnMgCu alloys were investigated by means of hardness testing， conductivity testing， exfoliation corrosion testing， and bright-field observation via transmission electron microscopy （TEM）.The results show that the optimal HTT temperature for high-alloyed AlZnMgCu alloys is 445 ℃. For the Al-Zn8.33-Mg2.08-Cu2.45 alloy， the optimal HTT process is as follows： solution treatment at 470 ℃ for 1 h → holding at 445 ℃ for 45 min → quenching → aging at 120 ℃ for 18 h → quenching.Compared with the conventional single-stage aging process， this process only adds an HTT step after the solution treatment， but it can significantly improve the corrosion resistance of high-alloyed AlZnMgCu alloys. This research can provide a theoretical basis for the industrial production of high-performance， corrosion-resistant high-alloyed AlZnMgCu alloys.