Study on hazard identification method for life cycle of patch board

For patch boards are widely-used, the consumer's demands on safety of them become more and more strict. Therefore identifying hazards during the life cycle of patch boards with formal methods has played an important role on improving the products' safety level. In the paper, hazard identification during the design stage can adopt the comprehensive list of hazard. During the logistics stage, the hazard and operability study method were adopted. Hazard identification during the usage stage, adopted the method of failure mode and effect analysis based on analytic hierarchy process and the fault tree analysis method to find the primary causes and triggering conditions of the accidents. Hazard identification during the recovery stage adopted the fault hypothesis analysis method to analyze environmental harm caused by improper handling.