The dispatching automation system of an ultra high voltage（UHV） grid based on visualization and data integration is proposed， the overall structure and main function design of the supporting system of which are described. Considering the running and supervising development of the ultra high voltage grid， the system is designed and realized with the latest computer technology and the power system visualization technology. The supporting system consists of the integrated bus， data exchange interface， man-machine interface， database interface， graphic interface， and visualization interface. It can provide a highly efficient and graphic means of visual display and reveal the essence of trends and high-level information on the power grid.