Titanium alloy is widely used in critical rotating components of aero engine such as compressor discs due to its excellent comprehensive properties such as high strength-density ratio, good creep and fatigue properties,etc. However, recent research found that the traditional life assessment method for some titanium alloys by low cycle fatigue test under triangular or sine wave mode is likely to overestimate the fatigue life in real operation condition, which may cause serious accident. Dwell fatigue shows significant lifetime reductions under 200 ℃ with hold periods at the peak stress of the cyclic loading compared to standard continuous low cycle fatigue. Moreover, crack usually initiates from the subsurface, which is hard to be detected during service and severely detrimental to the fly safety and reliability. This paper introduces both domestic and foreign researches on mechanism of titanium dwell fatigue, influences of hydrogen content, microstructure, load condition and dwell time on the behavior of dwell fatigue. Then a preventive action with future development is discussed.