Abstract <p>The microstructural evolution and kinetics of high-alloyed Al–9.1Zn–2.3Mg–1.6Cu alloy during homogenization and aging processes were studied. The diffusion activation energy and diffusion coefficient of Cu element in Al matrix, as well as the dendrite spacing of as-cast alloy, are used to obtain the homogenization kinetics equation of the alloy and predict the homogenization process. The predicted results indicate that the non-equilibrium eutectic phase can completely dissolve into the matrix after homogenization treatment at 470°C for 16.83 h, which is consistent with the experimental results. The activation energies and constants <i>k</i>₀ of GP zone, η'-phase, and η-phase calculated using differential scanning calorimetry (DSC) and Kolmogorov–Johnson–Mehl–Avrami (KJMA) equation are 110 kJ mol^–1 and 2.64 × 10¹⁶ s^–1, 88 kJ mol^–1 and 2.05 × 10¹⁰ s^–1, 166 kJ mol^–1 and 2.16 × 10¹⁷ s^–1, respectively. The kinetics equations of different precipitated phases are obtained to predict the aging process of the alloy, and the predicted results reveal that peak hardness of the alloy can be achieved by aging at 120^oC for 22 h after solid solution and quenching. The kinetics calculation results are in good agreement with the experimental results, providing guidance for the homogenization and aging treatment processes of high-alloyed Al–Zn–Mg–Cu alloy.</p>