The DSC curve characteristic and microstructure of 2524 aluminum alloy after stress coupled with electric field aging were investigated using Differential Scanning Calorimetry (DSC) and transmission electron microscopy (TEM), respectively. The results show that comparing to the alloy after aging at 190 oC/5 h without either external stress or electric field, the volume fraction of precipitated S phase increases in the sample after 25~130 MPa aging, the precipitation rate is increased by 30%, and the activation energy of S phase formation is decreased by 55 kJ/mol, while that of the alloy after aging under 130 MPa coupled with 16 kV/cm is decreased by only 38 kJ/mol