Our studies suggest that future studies on risk perception should give more attention about the fact that risk is subjectively represented and risk perception is domain specific.

There are so many indexes which can be used to describe urban fire risk, but each of them only characterize fire risk from one aspect, still with redundant information among them.

Furthermore, fault events are modeled and made into analysis based on the risk analysis theory of fault tree. After that equipment failure characters are confirmed and key factors are exacted.