With the widespread application of sensing elements and communication devices in power systems, modern power systems have become a cyber-physical integration system which is highly dependent on the communication networks. The improvement of informationization degree not only enhances the real-time perception and dynamic control capability of the system, but also increases the risk of cyber attacks on power systems. The frequent cyber attacks in recent years have sounded the alarm for the international community. At present, the research on cyber attacks in China and abroad is mainly focused on the modeling, defense and evaluation. The research on the entire process influence of cyber attack is still in its infancy. This paper analyzes the impact of cyber attack on typical power system scenarios of generation, transmission, distribution and user side. Firstly, the physical characteristics and structure of each scenario are modeled, and the vulnerability of the scenario subject to cyber attacks is evaluated after that. Then the response of the system under the cyber attack and the destructive effect of the cyber attack are analyzed. Finally, the existing research is summarized and prospected.