The properties of 7150 aluminum alloys in T6 and RRA states were analyzed by means of Vickers hardness test,conductivity test and tensile as well as intergranular corrosion testing.The effects of regression time on the microstructure of 7150 aluminum alloy in RRA state were investigated by optical microscopy（OM）and transmission electron microscopy（TEM）.The results show that the 7150 aluminum alloy presents higher strength with poor intergranular corrosion resistance.With the increase of regression time,the intergranular corrosion resistance of the 7150 alloy in RRA state is increased,while the strength is first increased and then decreased.When the regression time is 1 h,the main precipitate in the grain is GP area,accompanied with fine precipitateη′,which is distributed uniformly with the size of several nanometers.The precipitation phase at grain boundary is large and discontinuous with obviously precipitate free zone.The 7150 alloy treated at T6+185℃×1 h+T6 possesses both high strength and good intergranular corrosion resistance,presenting the optimal comprehensive performance.