The work aims to investigate the effect of solution treatment on the corrosion properties of Mg-3Gd-1Zn bio-magnesium alloy. The Mg-3Gd-1Zn alloy was performed by solution treatment at different temperature and then aged. The mi-crostructure of alloys was observed by scanning electron microscopy (SEM). The corrosion properties of Mg-3Gd-1Zn alloys in the simulated body fluid (SBF) were tested by mass loss and hydrogen evolution and the electrochemical behavior was evaluated by polarization curves and electrochemical impedance spectroscopy. The mass loss tests results showed that the corrosion rates of T6-460, T6-510, T6-520, and T6-530 alloys after immersed in SBF for 120 h were 2.48, 1.19, 0.86, and 1.17 mm/a, respectively. As the solution temperature increased, the corrosion rates of the alloys followed the order: T6-460 > T6-510 > T6-530 > T6-520. The hydrogen evolution results showed that the corrosion rates of T6-460 and T6-510 alloys increased with the increase of immersion time, while the corrosion rates of T6-520 and T6-530 alloys changed slightly. The corrosion rate trend obtained by hydrogen evolution after immersion for 120 h and mass loss were consistent. The electrochemical tests indicated that the current densities of the T6-460, T6-510, T6-520, and T6-530 alloys were 8.01×10?5, 3.85×10?5, 3.30×10?5 and 3.90× 10?5 A/cm2, respectively. As the solution temperature increased, the radius of the capacitive arc of the alloy increased first and then decreased and the pitting corrosion occurred during the corrosion process. T6-520 exhibited the best corrosion resistance based on all the four methods.