An Al 3 Ti/Al composite with high specific strength can be prepared by combining Al 3 Ti particles and an Al matrix. The large Al 3 Ti phase in the Al melt decreases castability and subsequently increases the casting defects. The research draws a probable solution to this issue such as redistribution of Al 3 Ti particles by ultrasonic treatment. By combining ultrasonic treatment with in-situ casting, under the effect of ultrasonic cavitation and acoustic flow, the in-situ Al 3 Ti particles are dispersed uniformly and finer. Hence, Al 3 Ti/Al composites with homogeneous microstructure and excellent properties can be prepared by using the high-intensity ultrasound. The 10%Al 3 Ti/Al(mass fraction) master alloy was prepared by ultrasound assisted molten salt method. Then, a 5%Al 3 Ti/A356 (mass fraction ) composite with a homogeneous microstructure and good tensile properties was fabricated from the Al-K 2 TiF 6 system via an ultrasound assisted remelting and dilution approach. The microstructure and tensile property of the composite have been investigated. The results indicate that the α-Al grains in the A356 alloy decrease from 250 μm to 135 μm (a 46% decrease) by adding 5%(mass fraction) Al 3 Ti particles. Moreover, the yield strength, ultimate tensile strength and elongation of the composite after T6 heat treatment are 232 MPa, 287 MPa and 3.5% (improved by 10.4%, 12.5% and 94.4%, respectively, in comparison with the A356 alloy).