Abstract: Based on the biological activity and pharmacological effects of garlic， we analyzed and identified organic sulfides contained in fresh garlic leaf extracts at four developmental stages with GCMS by organic solvent extraction method. Four different periods included: one month， two months， five months (including 2-3 months of winter hibernation) and seven months (mature) after planting. The results showed that the main composition of garlic leaf extracts could be divided into three categories: allyl sulfides， heterocyclic sulfides and alkyl sulfides， containing a number of components of garlic oil. Garlic leaf extracts composition and relative contents varied during development and ripening. A significant increase in organic sulfur was observed when the garlic was two months and seven months old. The most representative compositions were diallyl disulphide and 3vinyl1，2dithiacyclohex5ene， whose relative contents were 609%，1567%，235% and 1309%; 400%，1058%，230% and 149%， respectively.

Key words: garlic leaf, organic sulfide, relative content, growth period, pharmacological effects