1978.09- 1982.07 students majoring in tropical crop cultivation in South China Tropical Crops Institute (now merged into Hainan University)
1982.07- 1983.08 teacher, biology department, South China Tropical Crops Institute (now merged into Hainan University)
1983.08- 1987.08 Ph.D. student in plant molecular biology and genetic engineering, Department of Biology, University of Washington, USA.
1987.08- 1992.07 Associate Professor and Professor of Biology Department of Peking University (1989.05).
1992.07- 1993.09 Peking University biology department
1993.09- 1995.07 Dean of Peking University College of Life Sciences.
1995.07-1995.12 Peking University, Vice President, Dean of College of Life Sciences (1995.07 was elected as Vice President of the 8th All-China Youth Federation).
1995. 12-2002.04 vice president Peking University (elected vice president of the 9th all-china youth federation in July 2000).
2002.04-2007.12 President of China Agricultural University (deputy minister level) (elected as vice chairman of the 10th all-china youth federation in July 2005).
2007. 12—— Vice Chairman of the People's Government of Guangxi Zhuang Autonomous Region
Member of the 10th the NPC Standing Committee.
Member of the Scientific Committee of Education, Culture, Health and Science of the Eighth, Ninth and Tenth National People's Congress.