The microstructures and properties of ultrasonic and conventional cast 7050 aluminum alloys have been studied. Compared with the conventional cast alloy, the ultrasonic cast ingot (UI) is characterized with a finer microstructure than that in the conventional cast ingot (CI). For the hot-rolled plates, the UI alloy can be aged faster and aging-strengthened easier than the CI alloy. When aged at 120 A degrees C, the UI alloy reaches its peak strength after 8 h, with tensile strength of 602 MPa, yield strength of 547 MPa and elongation of 12.7%, respectively, whereas the CI alloy plate is with its tensile strength, yield strength and elongation of 536 MPa, 462 MPa and 15.0%, respectively, after peak aged for 12 h.