关键词: 计算机辅助设计，软件失效模式和影响分析，系统级软件FMEA，失效模式

Abstract: Software failure modes and effects analysis(SFMEA for short) is a important method to improve software reliability. To solve the tim}consuming problem of the artificial SFMEA，with a view to the SFMEA’s process, the research on system SFMEA computer aided design and corresponding tool were carried out, the specific steps of the system SFMEA were introduced, the aided design methods as follows were advanced; the software conventional level was made by modeling the functional unit; the software failure mode was acquired from the existent failure mode and the analysis results of the adjacent level; the software failure cause and corrective measures were designed, and the corresponding tool was developed to reduce the system SFMEA's workload and improve the system SFMEA's efficiency.

Key words: Computer aided design,Software failure modes and effects analysis,System SFMEA,Failure mode