Based on the EVGlobe threedimensional GIS platform, combined with highresolution remote sensing images and the Digital Elevation Model, an electronic sand table system is designed and developed for weather modification for Inner Mongolia. By the system, many functions are realized, such as the display of the layouts of operating equipment and observing stations of weather modification for Inner Mongolia, threedimensional visualized analysis and display of weather monitoring information like satellite cloud images, radar echoes, precipitation, threedimensional simulations of the programs and actual processes of weather modification. The system embodies the spaceground joint operating mode for weather modification and provides users with visual and intuitionistic geographic scenes of airplanes flying through the clouds and the effectiveness of catalyst seeding, and plays a positive role in enhancing capability of command and decisionmaking and operating for weather modification.