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The characteristic age-hardening response of Al-Mg-Cu alloys with compositions of a different Cu/Mg ratio have been investigated by the hardness measurement, differential scanning calorimetry (DSC) and tensile test.The Al-Cu-Mg alloys show rapid age-hardening phenomena initially, then almost unchanged hardness for prolonged periods before the second stage of hardening.The rapid age-hardening contributes to increase hardness as much as 50％ of the peak age-hardening at 170℃.Small clusters (designated as nanoclustes) which form during initial age-hardening are believed to be responsible for the rapid age-hardening effect.