The Spatial Data Intelligence China Conference is committed to promoting the research paradigm of spatial data and the innovation and application of spatial intelligence theory and technology in the fields of spatiotemporal big data, smart cities, transportation science, social governance, and so on. In order to further facilitate the theoretical development and application of spatial data intelligence research, and to exchange new theories, new problems and new methods in related fields, the 2nd China Conference of Spatial Data Intelligence (SpatialDI 2021) will be held in Zhejiang Hotel, Hangzhou from April 23-24 . The conference intends to invite Academician Renzhong Guo (Dean of Research Institute for Smart Cities, Shenzhen University), Academician Huadong Guo (Aerospace Information Research Institute, Chinese Academy of Sciences), Prof. Hui Lin (Dean of School of Geography and Environment, Jiangxi Normal University/Academician of International Eurasian Academy of Sciences), Prof. Yunhao Liu (Dean of Global Innovation Exchange, Tsinghua University/ACM and IEEE Fellow), Prof. Christian S. Jensen (Aalborg University/Fellow of European Academy of Engineering), and Prof. Jianwei Yin (Associate Dean of College of Computer Science and Technology, Zhejiang University).