Object To study the organosulfur compounds of Allium sativum L. Methods Compounds were separated by silica gel column and TLC, HPLC. Their structures were elucidated by spectroscopic analysis. Results One disulfied, 3-allyldisulfanyl-propenal (Ⅰ) and one dithiin, 3-vinyl-3, 4-dihydro- dithiin-1-oxide (Ⅱ) and one thiosulfinate, (E/Z) 1-propenyl allyl thiosulfinate (Ⅲ) were identified. Conclusion Compounds Ⅰ and Ⅱ are new.