65438+July 0989—65438+February 0993: Beijing Sewage Treatment Research and Management Institute, researcher.
1March 1993 ——1March 1994: Director of the Operation Department of Beijing Gaobeidian Sewage Treatment Plant;
65438+July 0994—65438+March 0999: Minister and Deputy Chief Engineer of Technical Engineering Department of Sewage Engineering Department of Beijing Municipal Engineering Bureau;
65438+July 0994—65438+July 0995: Haikou Sewage Treatment Company, Hainan Province, chief engineer;
1April 1999—July 2003: Deputy Chief Engineer and Director of Production Planning Department of Beijing Urban Drainage Group;
May 2006-July 2009: General Manager of Beijing Jingcheng Water Co., Ltd.;
July 2009 to present: School of Environment, China Renmin University;
August 2003-April 2009: Beijing Urban Drainage Group, Chief Engineer;