Abstract:Objective To study the changes of SOD, MDA and GSH-Px in sera of Monglian gerbils.Methods The gerbils at the age of 1 month, 3 months and 24 months were used in the experiment, and the sera were collected for determining the SOD,MDA and GSH-Px. Results At the age of 3 months, MDA was the lowest, but GSH-Px was the highest, while the SOD was ascending with growing. Conclusion The changes of GSH-Px showed the direct relation to MDA, while the changes of the SOD was irrespective to the changes of MDA.