Abstract: Green onions oil was extracted by Simultaneous Distillation and Solvent Extraction(SDE) method from green onions,and analyzed by GC/MS,25 peaks were separated and identified,which contents 13 sulfur-containing compounds,such as allyl methyl sulfide,methyl thiosulfinates,propyl methyl ester thiosulfate sulfur,trans allyl propyl three sulfur ether. 3 aldehydes:2-methyl-2-pentenal,2-butyne diethyl acetal,3-butyn diethyl acetal. 6 esters:such as 2-butenoate,3-pentenoic acid 4-methyl-methacrylate,2-butenoic acid vinyl ester.2 acidics,vinyl butyrate,2-methyl enanthate. 1 alcohol,2,4-dimethyl-3-pentanol. Four extraction parameters including distil- off temperature, ratio of liquid to material, extracting time, bath temperature were optimized using orthogonal design based on single factor investigations for the extraction yield of sulfur- containing compounds. And optimum extraction condition for distil-off temperature 95 ℃,ratio of material to liquid 1 ∶2(g∶m L),extracting time 3.5h,bath temperature 55℃. Under these conditions,the average content of sulfurcontaining compounds was 25.15mg/g.