Aromatic and medicinal plants are used by man for different needs including food and medicinal needs for its biological properties attributed mainly in phenolic compounds and for its antioxidant capacity. In our study, the aim is to compare three extraction solvents by evaluating the contents of phenolic compound, the contents of flavonoids and the antioxidant activities of extracts from different methods of extracting the aerial part of an endemic medicinal plant from Morocco. This activity was also confirmed by three methods (2,2-diphenyl-1-picrylhydrazyl (DPPH), Antioxidant Reducing Power of Iron (FRAP) and Total Antioxidant Capacity (CAT),). The results showed that this plant is rich in polyphenols and flavonoids, as well as it have a very important antioxidant capacity whatever the solvent or the extraction method. This suggests the importance of using extracts from this plant as a new natural source of food additives and potent antioxidants in the food industry.