Titanium and its alloys exhibit inherent limitations in complex environments due to their low hardness, poor wear resistance, and weak high-temperature oxidation resistance. Solid powder-pack infiltration has emerged as an effective surface modification technique to enhance the surface hardness, wear resistance, and high-temperature performance of Ti-based materials. The morphology and properties of the layer are significantly influenced by process parameters such as temperature, holding time, and infiltrant composition. The incorporation of carbon and boron atoms into the Ti lattice can substantially improve surface hardness and wear resistance, while aluminum infiltration enhances high-temperature oxidation resistance and strengthens the interfacial bonding between the layer and substrate. By optimizing process parameters, multi-component layers can be fabricated to achieve superior comprehensive properties. However, challenges remain, including surface porosity in borided layers, weak adhesion between the layer and substrate, incomplete development of multi-element solid powder-pack infiltration techniques, and the need for prolonged processing times at elevated temperatures. Addressing these issues is crucial for advancing the practical application of infiltration layers on titanium alloys.