This paper presents the composition of the essential oil extracted from Artemisia scoparia in different phenophases. The essential oil has been extracted by hydro distillation and analysed by gas chromatography coupled with mass spectrometry (GC-MS). The obtained results emphasized the presence of some major chemical compounds in the maturity period, such as beta pinene (2.92%), methyl eugenol (18.63%), capillene (33.33%), spathulenol (8.45%) and ent-spathulenol (14.84%), while during the flowering phase beta-pinene (9.30%), limonene (2.58%), gamma-terpinene (3.05 %), capillene (66.20%). During the growing season, beta-pinene (9.74%), limonene (3.52%), gamma-terpinene (3.93%) and capillene (71.22%) were determined. In the three phenophases the main common chemicals were beta-pinene and capillene.