Ag/Mg-Al-O composite was prepared by the calcination of Ag-containing Mg-Al hydrotalcite-like compound and metallic Ag supported on periclase phase Mg-Al-O was obtained.The as-prepared Ag/Mg-Al-O composite exhibits good NOx storage capability in a relatively low temperature range of 150-300 ℃.The highest NOx storage　capability of 7.3 mg/g was achieved at 150 C,while a lower NOx storage capability of 5.1 mg/g was achieved at　300 ℃.Meanwhile,ca.25％ of NOx was observed to decompose to N2 at 300 ℃.In situ FTIR results suggest that　NOx mainly stored in Ag/Mg-Al-O catalyst in the form of bridging nitrites located on periclase phase Mg-Al-O.