ABSTRACT
With dangerous materials or high hazardous energy must be used in complex system, such as weapons systems, and commercial aircraft, hazards will always exist in the system. System safety is the formal process of identifying and controlling risk (USA 2012). As systems become more complex and more hazardous, more effort is required to understand and manage mishap risk. The key to system safety and effective risk management is the identification and mitigation of hazards (Ericson 2005, T.D. Zhao et al. 2012). In order to ensure the safety of system, it is necessary to study hazard analysis technique, as well as which is meaningful for improving the system design.
