The effects of solid solution and aging treatments on the microstructureal evolution and hardness of the GWZ932 alloy in the rolled state were investigated by means of optical microscopy, X-ray diffractometer, Vickers hardness tester, scanning electron microscopy, transmission electron microscopy, and high-angle annular dark-field scanning transmission electron microscopy. The results show that the alloy microstructure in the rolled state mainly consists of α-Mg, massive 18R-LPSO phase, lamellar 14H-LPSO phase, rare-earth-rich phase and Zn-Zr phase. The lamellar 14H-LPSO is almost completely dissolved into the matrix by 500℃ solid solution treatment for 2 h, and the elongated acicular 14H-LPSO is precipitated from the α-Mg matrix after 2 h of solid solution, and its volume fraction gradually increases with the extension of time, and the volume fraction of acicular 14H-LPSO reaches 16% at 6 h of solid solution, and the acicular 14H-LPSO phase dissolves and re-precipitates the lamellar 14H LPSO (size: about 14.9 μm in length and 8.2 μm in width), and a small amount of undissolved acicular 14H-LPSO phase grows to form rod-shaped 14H-LPSO (23.4 μm in length and 1.98 μm in width). Increasing the solid solution temperature to 520℃, the solute atom diffusion rate is accelerated, resulting in the complete dissolution and re-precipitation time of lamellar 14H-LPSO is advanced to 1h and 2 h, respectively, and the size of the re-precipitated lamellar 14H-LPSO phase (12.6 μm in length, 5.1 μm in width) is smaller than that of the re-precipitated one after solid solution at 500℃ for 8 h. precipitation and transformation, indicating that the precipitation and dissolution of the acicular 14H-LPSO phase and its content are affected by the solid solution temperature and time. The age-hardening curve was investigated to reach peak hardness at 520℃×4 h+225℃×64 h. On this basis, the age-hardening behaviour of the alloy after solution treatment at 520℃ for 4h was investigated and the results showed that the alloy reached peak hardness at 225℃ for 64h of age treatment. The room temperature tensile strength (UTS), yield strength (YS) and elongation (EL) of the alloy under peak aging conditions were 396.3 MPa, 274 MPa and 12.7%, respectively. The increases were 23.8%, 7.4% and 69.3%, respectively, compared to the rolled state. The excellent strength and plasticity of the alloys arise from the precipitation of a columnar β' phase of about 28.9 nm long and 8.9 nm wide with an average area fraction of about 11.7% and a basal 18R-LPSO/γ' phase in the α-Mg matrix.