Abstract: Studies on Mass Spectra of Androgenic-Anabolic SteroidsZhang Yizhong;Liu Xin;Yie Li;Zhang Changjiu;Zhu Shaotang;Yang Zeyi(National Research Institute of Sports Medicine,1 AndingRoad,Beijing 100029,China)Zhang Ji,Zhou Tonghui(Chinese Academy of Material Medica,1 Xian NongTan Road,Beijing 100050,China)Received Abstract:More than 16 standards of androgenic-anabolic steroid were derivatized sith MSTFA/TMSI and analyaed with GC/MS.The fragmental mechenism was discussed.Keywords:androgenic-anabolic steroid,mass spectrum,fragment