1. Introduction 2. Influencing factors for evaluating probability of cladding failure 2.1 Cladding temperature 2.2 Oxidation 2.3 Hydrogen 2.4 Rod internal pressure and hoop stress 2.5 Hydride reorientation 2.6 Gap between pellet and cladding 2.7 Pinch load 3. Application of the factors for evaluating the spent fuel cladding failure 4. Conclusion REFERENCES