It is considered that the occurrence of accidents in gas station contributes to the existence of hazards and the imperfection of control measures on the one hand, and also to the valid deviation and deviation transfer of system node parameters (such as flow rate, pressure and temperature ) of the process flow on the other hand.

On the base of understanding the significance of risk surveillance,by examples introduces systemically the application of cost warp analytical method and schedule warp analytical method on project risk surveillance.