Abstract: In the preparation process of particle reinforced aluminum matrix composites, there are problems such as uneven particle distribution, severe agglomeration, poor particle/matrix wettability and multiple shrinkage and porosity in the microstructure, which seriously affects the performance of the material. Double sized Ti C particles with a size of 1 μm and 50 nm were used as the reinforcing phase, and 2219 Al alloy was used as the matrix to prepare high-performance composites by ultrasonic casting method. The microstructure, mechanical properties, hardness and friction and wear properties of the composites were studied. The results show that the micron particles serve as carriers for nanoparticles, which enables nanoparticles to adhere to the periphery of micrometer particles. The dual sized mixed particles are basically uniformly dispersed in the matrix, with only partial aggregation. The ultimate tensile strength, yield strength and hardness of the composite material reinforced with double sized particles are 245 MPa, 116 MPa and 137 HV, respectively, which are 114.9%, 123.1% and 104.4% higher than those of the base aluminum alloy. The composites reinforced with double sized particles under different loads have the lowest wear volume and friction coefficient. The tensile fracture of the composite reinforced by double sized particles has more tearing edges and dimples, which shows higher toughness. The orowan strengthening is the most important strengthening mechanism of the composites reinforced by double sized Ti C particles.