Abstract: Ensuring power security is a basic requirement for implementing the overall national security concept. At present, China's power system is evolving towards the new power system. The uncertainty of renewable energy, low immunity and weak support of equipment, and other characteristics are superposed by increasingly severe extreme events, making it a complex and challenging task to improve the resilience of power systems and prevent power security risk. Based on the detailed introduction of the challenges faced by the new power system in improving the resilience, this paper summarizes techniques of risk prevention and emergency management for the new power system in coping with extreme events from the four levels of "risk assessment, investment planning, prevention/preparation, and response/restoration", and systematically analyzes the key technologies and research priorities at each level. Finally, the realization path of ensuring the power security of the new power system is prospected, and the directions of further research are put forward.