Abstract: In recent years, power systems present several new features, including high penetration of renewables, power electronic equipment integration, load diversity, and cyberphysical interdependency. In addition, the security threats are increasing, and the security situation of power grids becomes severe. Based on the current development of the power grid in China, this paper proposed a definition of "resilient power grid." A resilient power grid can comprehensively, quickly and accurately sense the operation status, cooperate with the internal and external resources of the power grid, proactively anticipate and prepare for various disturbances, defend and quickly restore critical loads, and learn to continuously improve itself. This paper first introduced the meaning and application of the term "resilience" and briefly summarized concepts related to power system resilience. Then, resilient power grid was defined and explained. Further, the meaning and key features of resilient power grid and its relationship to energy internet were clarified. Finally, research needs on resilient power grids were discussed.