Fresh aerial parts of Thymus carmanicus JALAS scov. Nov are collected from charbagh montaines 2250 m from Gorgan state on mide of July 2001, essential oil extracted by steam distillation method. To produce oil on yields of 0.82% w/w. Essential oil were analyzed by GC and GC/MS.The major constituent of the oil were, pulegone (25.37), 1.8- cineole (9.47), carvacrol (8.94), trans- p- menth- 2- en- 1- oL (8.49), verbenone (8.04%), borneole (6.37%), p- cymene (6.13%), menthol (5.76%), piperitone (5.43%) and thymol (3%), being predominant.