Complex networked system has changed the modern power system production mode deeply.At the same time,the integration of communication and computing technology has also brought new security challenges to the power system.Different from the "error data" caused by the faulted control equipment,malicious attacks which often come from cyberspace and external physical world can construct "false data" to avoid the safety detection of "bad data" which is based on estimation and analysis,the resulting harm can spread rapidly inside the power system through the chain reaction,and it may cause great damage to the power system.So this article aims to study the attack detection and security defense of the power system,to discuss the study contributions of the scientific research community recently and limitations of these studies,as well as the future development trend of this topic.Correspondingly,in Section Ⅰ,the new security problems of modern power system in the process of 3C integration are discussed; in Section Ⅱ we give a brief on the research and achievements of the research community in recent years,and discuss the limitations of these studies; Finally,in Section Ⅲ,we put forward the unresolved problem and some valuable research directions in the future.