The volatile components of P. farcta (pods), growing wild in Zabol and Kashan, were analyzed by GC and GC-MS. Among components, which were identified,Octanoic acid (4.63%), Nonanoic acid (4.72%), Thymol (11.31%), Hexadecanoic acid (33.65%), oleic acid (22.04%) (Zabol), 1-Hexanol (4.59%), 3-Nonen-1-ol (4.96%), Nonanoic acid (4.65%), 2(3H) - dihydro-5-pentyl Furanone (9.95%), Hexadecanoic acid (16.93%) and oleic acid (12.15%) (Kashan) were the main constituents. But, in other report from Tunisia Methyl hexadecanoate, 9-Methyl octadecanoate, Phytol and 9-Ethyl octadecanoate were mentioned as major component. Antioxidant potential of the extracts were evaluated using Inhibition of hydrogen peroxide free radical that roots (Zabol area:IC50=14.12 µg/ml and Kashan area: IC50=10.72µg/ml) and branches (Zabol area:IC50=23.44µg/ml and Kashan area: IC50=14.70µg/ml) of the plant showed strong effectiveness in this antioxidant test. Total phenolic contents of the plant extracts were also measured by Folin-Ciocalteu reagent and results this test were parallel with antioxidant test.