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With the deepening of research on embedded systems in weapons and equipment, traditional methods are difficult to meet the analysis needs of complex systems. In order to improve the efficiency of system R D and evaluation, it is an inevitable trend to analyze the safety and reliability of torpedo ESA with formal Systems modeling language. Based on the traditional reliability analysis of the security system structure, this paper carries out the corresponding system model modeling process based on SysML, and takes Functional requirement, system architecture, activity view and temporal logic control as the constituent elements of the security and action reliability analysis to model the fault propagation of the system functional model; Finally, the Tree model of accident is constructed with the safety Modeling language to obtain the influencing factors of reliability, and the safety and reliability analysis based on system engineering is realized.