Abstract: As the heat flux density of electronic devices continues to increase, the hot spots caused by heat accumulation seriously affect the performance and application devices. In this study, annealed graphite (APG)/6061 Al with different graphite layer thickness ratios were prepared using vacuum hot-press method. To enhance the wettability between the annealed graphite and aluminum alloy, annealed graphite was coated with a thin layer of titanium by vacuum micro-evaporation plating, which proved to be effective and efficient. The influence of titanium modification on the microstructure and interface bonding of annealed graphite/aluminum composites was discussed, and the effect of the annealed graphite/aluminum layer thickness ratio on the overall thermal and mechanical properties of the composite was studied. Similarly, the results show that a 400 nm thick interface layer is formed between the annealed graphite and aluminum, and the directionally annealed graphite material modified by titanium is in close contact with aluminum. As the thickness ratio of each phase of Al∶APG∶Al is 1∶3∶1, the composite material has a thermal diffusion coefficient of 901 mm²·s⁻¹ in the in-plane direction and the maximum flexural strength of the composite material is 141 MPa.