TiAl alloy has important application value in aerospace and other high-temperature structural components due to its low density, high specific strength, and excellent creep resistance at high temperature. However, the high-temperature oxidation resistance of TiAl alloy in the environment above 750 ℃ is poor and the service life of some high-temperature service components under the condition of hot corrosion and high-temperature wear is reduced, which restrict its application. Double glow plasma alloying surface technology is an important way to enhance the surface protection ability without changing the overall performance of the substrate. The basic mechanism of the double glow plasma surface alloying technology was reviewed. The unit infiltration, dual infiltration, multi-component co-infiltration, and the composition and structure of infiltration coatings on high temperature oxidation resistance, hot corrosion resistance, and wear resistance were discussed. Finally, it outlined the future developing trends in the view of theoretical research, preparation process, and engineering applications.