Abstract: The urban underground space has rapidly developed.Because of the difficult recovery and estimation,the underground space planning has received increasing attention.However,the traditional 2D planning techniques are difficult to describe the complex underground geological and environmental information.3D GIS technology provides a better method to solve this issue.Based on the analysis of urban underground space planning,the three-dimensional GIS technology and its conceivable role in the underground space planning are analyzed.A design of 3D supporting information system is put forward for the underground space planning,focusing on its architecture and subsystems integrated solutions.