Abstract: The aluminum alloy for sports equipment was prepared by high-energy ultrasound. The effects of ultrasonic power on the microstructure and porosity of the aluminum alloy were studied. The results show that the grain size of the aluminum alloy is refined by high-energy ultrasound, the density is increased and the porosity is reduced.With the increase of ultrasonic power, the grain refinement effect is more obvious, the shape coefficient becomes larger, the grain becomes rounder, the density of the aluminum alloy gradually increases, the porosity defects decrease, and the tensile properties of the aluminum alloy are better.When the ultrasonic power is increased from 0 to 900W, the grain size decreases from 63.4 μm to 43.2 μm and the shape coefficient increases from 0.41 to 0.72. When the ultrasonic power is 900W, the tensile strength and elongation are 200.5MPa and 4.36% , respectively, which are 31.1% and 27.5% higher than those of the alloys without ultrasonic treatment, respectively.In addition, the mechanism of grain refinement and porosity reduction by high-energy ultrasound was also studied.