Solution treatment is a useful way to improve the degradation resistance of Mg alloys.In this work,effects of solution treatment temperature on mechanical and biodegradable properties of an extruded Mg-2Zn-1Gd-0.5Zr alloy were studied.Microstructure analysis,tensile test,three-point bending test,immersion test and electrochemical test were performed.The results showed that increasing solution temperature decreases the mechanical properties of the alloy.However,three-point bending test revealed that the solution-treated alloy at 510 ℃ could maintain 95％ of its maximum bending force (Fmax) during the 28-day immersion period.After treatment at 510 ℃ for 5 h,all the second phases were dissolved into the alloy,the galvanic corrosion was inhibited,and the alloy exhibited good corrosion resistance with a corrosion rate of 0.35 mm·year-1 in Hank’s solution.