Abstract: Systematic Analysis of Corticosteroids in Human Urine by GC/MSXu Youxuan; Shen Li; Wang Shan; Wu Yun; Cui Kairong; Zhang Changjiu; Zhu Shaotang(China Doping Control Centre, National Research Instritute of Sports Medicine,Beijing 100029, China)Abstract: A systematic procedure is established in this paper. Corticosteroids are extracted from human urine by Sep-pak column,and derivatized by methoxyamine and trimethylsilylimizole. The results show that the drugs can be detected confimatorilly in selected ion monitoring mode.Keywords: corticosteroids, human urine, GC/MS