Abstract: Situation Awareness (NSSA) is the organ of Power Grid, and it is the foundation of Regional Power Grid Operation Reliability. According to the statistics of China Southern Power Grid Corporation, the power grid dynamic sensing technology has been widely used in China Southern Power Grid in recent years. So, in the face of dynamic sensing technology in the substation what are the risks, and how to maintain? The following on the basis of the current digital substation situational awareness of power grid equipment for real-time data acquisition, data processing standardization, and through technical analysis of abnormal conditions. To study the potential threats to the power grid, and then do a good job to prevent and control the trend of change.