Effects of Zr on glass forming ability and thermal stability of Fe-Al-Ga-P-C-B-Si amorphous alloy have been analyzed by XRD and DSC.The experimental results reveal that the alloy retains amorphous features with Zr content less than 2.0%（atom percentage）.Although the DSC curve had no obvious glass transition,the XRD observation indicated that the alloy with 1% Zr content（atom percentages）,which is attributed to the exothermic peak of initial crystalline phase,had blanketed glass transition.DSC curves of the alloy with 0.5% and 2% Zr contents presented apparent glass transition temperature and wider undercooled liquid region,respectively,and the position of crystalline exothermic peak shifted towards higher temperature area,which reveals that the alloy have high glass forming ability and thermal stability.In addition,the thermal stability was verified by the parameters γ.