Essential oil isolated from the Artemisia scoparia Waldst.et Kit. by hydrodistillation method. Samples for analysis we collected in different areas of the Republic of Buryatia and Mongolia. The content of the essential to vary quite widely from 0,06 to 0,40% from aerial parts of A. scoparia , growing in various districts of Buryatia and in Selenginsky aimak of Mongolia. Component composition analyzed by gas-chromatography-mass-spectrometry of the oil. In total, there were found more than 100 compounds. The main components of essential oil were identified: p -cymol (0,6–15,2%), limonene (0,1–6,3%), α-pinene (0,2–10,1%), β-pinene (0,4–8,9%), germaсrene D (11,5–40,3%), trans -β-ocimene (0,3–5,4%), caryophyllene (4,6–13,8%), spatchulenol (4,0–11,7%), caryophyllene oxide (4,3–15,6%). The composition of the main substances of essential oils of A. scoparia can be divided into the following chemotypes: 1) containing acetylenic hydrocarbons – from the provinces of Gilan, Mazandara, Kashan, Tigran Iran, Tajikistan, as well as the European part of the CIS; 2) containing monoterpene and aromatic compounds - from the province of Khorasan, Iran, India, South Korea 3) containing monoterpene and sesquiterpene and aromatic compounds - Kazakhstan and Mongolia. The main components of the essential oil of A. scoparia presented mono-and sesquiterpene compounds for Buryatian flora. This is the third chemotype of A. scoparia from geographically close regions.