2002-Deputy Director, Professor and Doctoral Supervisor of Peking University Institute of Remote Sensing and Geographic Information System. Since 2003, he has concurrently served as the vice president of Peking University Digital China Research Institute.

1997-2002, professor, doctoral supervisor, director of GIS Department of Peking University City and Environment Department.

1992- 1997, associate professor, department of urban and environmental science, Peking University, established GIS teaching and research section and served as the department head.

199 1- 1992, postdoctoral fellow and lecturer in applied mathematics and information science, Department of Mathematics, Peking University.

1984- 1990, graduate student, Department of Urban and Environmental Sciences, Peking University (formerly Department of Geography), doctor of science degree; His research interests are geographic information system and remote sensing.

1980- 1984, Bachelor of Science, Department of Geology, Peking University.