Abstract: The new challenges facing grid monitoring and control in its own development needs and changes in the external environment are teased out.The new requirements of surveillance control,such as global awareness of the power grid,prevention and control of global risks,unified and coordinated control at multiple levels and flexible adaptation to external environment changes are clarified.In view of the new challenges and new demands,a new mode of global supervision and control of large power grid is proposed,which points out that it needs a wider range of surveillance,more types of surveillance content,more powerful real-time data processing capability,higher data real-time and consistency and other specific content.Based on the concept of"physical distribution and logical unification",the overall framework of global monitoring is designed,and the key technologies that need to be further studied to realize the new mode are given.