Abstract: This paper proposes a wind turbine blade reliability simulation and analysis method based on fault physics. By drawing task profiles and load profiles,the parameters such as blade material,structure,environmental conditions,and usage are loaded into a numerical calculation model for transient thermodynamics,vibration stress,and multi-stress coupling analysis. The results show that the maximum stress and heat concentration mainly occur at the root of the blade,and deformation mainly occurs in the middle to tip section of the blade. Starting from the causes and mechanisms of faults,the fault patterns of the blades are studied,and the collected fault information is processed using Failure Mode,Effects,and Criticality Analysis（FMECA）. Qualitative assessment indicators are quantified to establish a blade hazard matrix and FMECA table,conducting reliability assessment of high-risk fault data under failure modes,providing necessary theoretical support for engineering practices. This method offers higher precision compared to traditional manual reliability analysis methods,running parallel with development,production,maintenance,and management,and ensuring the achievement of product reliability requirements through continuous updates and iterations,providing new ideas and implementation methods for the reliability analysis of wind turbine blades.