Study on accurate calculating the risk of the SCADA

Starting with the discovery of Stuxnet SCADA systems have been the target of cyber threats. Original SCADA system is operating in closed-independent structure is safe from outside attacks, but by the development of IT industry With the advent of the Internet as a connection point is always exposed to hacking threats. As a result, if cyber attacks occur in the SCADA system as a national major economic and social problems will occur. So in this study, Accurate and concise risk calculation propose. And this formula is can be that indicator of new system's efficiency.