Several network connection-based visualization methods including the surface， bars， pipes and animated arrows are designed to express point and line data in power system control centers. Common visualization topics are proposed. The spatial interpolation algorithm in surface plotting is improved and the application of color-mapping is discussed. Based on an existing EMS 2D graphics platform， a 3D visualization software module is designed and developed， which has the features of rich display forms， good real-time performance， cross-platform implementation， and easy integration with other systems. This module has been put into operation in several power system control centers with the real-time effect and performance presented.