Abstract: Lysimachia microcarpa has a rich and long-lasting odor.which is also used as a raw ma-terial to extract Lysimachia concrete. There are 106 compounds were identified qualitatively and quantitatively in the essential oils from this plant by means of GC and GC / MS analyses. The re-sults showed that aldehydes.alcohol and acids are main constituents and lauric acid.bomeol and hexahydrofarnesyi acetone are main compounds in the essential oils.

Key words: Lysimachia moicrocarpa