Abstract: Study on the Chemical Constituents of Volatile oil in Green Chinese Onions(Allium Fistulosum L)Guo Haichen;Gui Lan;Zhu Qianxiang;Zhou Xiuqing;Wang Ling(Analytical and Testing Center,Jilin University Changchun 130023,China)Received Abstract:Three volatile oils were individually obtained from distillation of stem,leaf and flower of green Chinese onions(Allium fistulosum L).18 chemical constituents in volatile oils were identified with capillary gas chromatography-mass spectrometry.Main components are sulfur-containing compounds such as dimethyl disulfide,dimethyl trisulfide,methyl propyl disulfide,methyl propyl trisulfide,methyl propenyl disulfide,methyl propenyl trisulfide,propyl propenyl diSulfide,propyl propenyl trisulfide,dipropyl trisulfide etc as well as oxygen-containing compounds such as 2-methyl-2-pentenal,2-tridecanone etc.In the paper,the relative content comparison of chemical constituent between green Chinese onions oil and onion oil was given too.Keywords:Allium fistulosum L; volatile oil,GC/MS