In this study, nano?TiO₂ was used as the additive phase, and B₂O₃ and H₃BO₃ were doped in a certain proportion, and then 4% nano?oxide particles reinforced Al matrix composites were prepared by high?energy ball milling and powder metallurgy. Finally, Al matrix composite rods were prepared with an extrusion ratio of 16∶1 at 723 K. The results show that the dispersion distribution of nano?oxides in Al matrix can be realized after 4 h ball milling. After vacuum hot pressing at 893 K, the addition phase reacts with the Al matrix in?situ and forms Al₂O₃ etc. When the molar ratio of Ti to B is 1.0∶1.5, the mechanical properties of the composites are the best. At the same time, when the chemical composition of the precursor of B element is different, the mechanical properties of the composites are significantly different; the tensile strength of TiO₂+H₃BO₃/Al at room temperature and 623 K is 507.7 MPa and 151.3 MPa, respectively, showing the highest room temperature mechanical properties; the tensile strength of TiO₂+B₂O₃/Al at room temperature and 623 K is 353.7 MPa and 167.1 MPa, respectively, manifesting the excellent high?temperature mechanical properties.