1991.10—1995.10 lecturer, Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University.
1995.11—2000.10 Associate Professor, Nutrition and Food Hygiene Laboratory, School of Public Health, Tianjin Medical University.
2000. 1 1 —— Professor, Nutrition and Food Hygiene Laboratory, School of Public Health, Tianjin Medical University.
From September 2003 to September 2004, he was a visiting scholar sent by Tianjin Education Commission at the University of Western Ontario in Canada.