Al-Zn-Mg-Cu series aluminum alloy belongs to the aging hardening alloy, which improves the strength mainly by precipitation hardening. The precipitation hardening heat treatment of 7039 aluminum alloy in Al-Zn-Mg-Cu was studied in this paper. The experiment that using four different heat treatment conditions of T4, T6, T73, T76, and four different quenching method (cold water, hot water, hot oil, blast) were carried out. In order to find the optimum heat treatment process parameters, the hardness measurement of the workpiece was made in different processing parameters. Research results show that: When the aging treatment of T73 gets higher hardness, the hardness of the aluminum alloy is less affected by quenching method, but the blast quenching is significantly lower than the other three ways. Due to the solid solution treatment, the alloy surface is in the compression stress state, which should use a more gentle way of quenching, such as boiling water quenching, oil quenching ,to reduce the internal stress of the workpiece.