Essential oil were analyzed by GC-MS (a Perkin Elmer Clarus 600 GC-MS system coupled with a Perkin Elmer Clarus 600C MS).Helium (1 mL/min) was used as a carrier gas. The initial temperature was 60 ํc (2mim),then was increased to 200°c at rare of 5 °c/min, and remained at 200°c for 5 min, and then was continued to increase to 250 °c at rate of 10°c/min ,with a final stage of 10 min at 250°c.The essential oils were placed in a glass capillary column (60m ×0.25mm×0.25um) filled with Rtx-5MS,and the oven temperature was programmed from 50°c to 250°c at a 5°C/min dynamic rate,