<p>37 vol% SiC_P/2024 composites were fabricated by the hot-pressing method. The effects of single (S) size and size combinations (C) of SiC_P on the microstructures and mechanical properties of SiC_P/2024 composites were investigated. The results showed that, for the S-SiC_P/2024 composites, the larger Van der Waals forces between S-7 μm SiC_P led to an increase in the agglomeration of S-SiC_P. The decrease in Van der Waals forces between the S-55 μm SiCp improved the homogeneity of the S-SiC_P distribution. The tensile strength of the composites decreased from 364 to 259 MPa when the S-SiC_P size increased from 7 to 55 μm. This was attributed to the strong interfacial bonding between the S-7 μm SiC_P and the Al matrix, which enhanced the load transfer efficiency. The effects of fine-grain strengthening and dislocation strengthening in the S-7 μm SiC_P/Al composites were also more pronounced than those in the S-55 μm SiC_P/Al composites. Cracks formed at the interface between the 2024 matrix and the S-55 μm SiC_P, which resulted in a reduction in the tensile strength of the composites. When different C-SiC_Ps were used, the uniformity of C- SiC_P distribution in the composites decreased with an increase of the C-7 μm SiC_P percentage. The strengthening effect of C-7 μm SiC_P was also better than that of C-55 μm SiC_P. At the C-SiC_P size ratio of 55 μm:7 μm=0.25:0.75, the 37 vol% SiC_P/2024 composite exhibited a more uniform SiC_P distribution and demonstrated superior mechanical properties, with a tensile strength of 319 MPa and an elongation of 0.46%.</p>