Abstract: Large and complex systems have complex structures and diverse functions, thus the occurrence of a serious fault will cause huge losses. However, the existing methods of fault analysis and management tools are insufficient. Based on traditional FMECA methods, combining the TRIZ theory and methods, and taking the SG series of laser device as research objectives, this paper presents an improved FMECA management processes and methods of analysis, aiming to carry out diversity analysis of failure mode and effect, find complete corrective action to enhance the failure rate of zero, and reduce the risk of system operation