Abstract:Ni-based single crystal superalloys have excellent comprehensive properties at high temperature, and are widely used in hot-end components such as blades of aero-engines and gas turbines. Fatigue failure is one of the main failure modes of blades in service. Based on the research status of fatigue behavior of Ni-based single crystal superalloys, the fatigue damage mechanism of Ni-based single crystal superalloys was reviewed. The effects of crystal orientation, temperature and loading mode on fatigue behavior were discussed. The methods to optimize the fatigue life of Ni-based single crystal superalloys, such as composition optimization, heat treatment and surface treatment, were introduced. Finally, the application of some advanced testing techniques, such as in-situ testing, in the study of fatigue behavior of Ni-based single crystal superalloys was proposed, and the development trend of fatigue behavior research of Ni-based single crystal superalloys was prospected.