The volatile oil of the root of Codonopsis lanceolata Traut. (Benth. et Hook.) was isolated by steam distillation and extraction method and fractionated by silica gel column chromatography. The total volatile oil and each fractions were analyzed by GG, GC-MS and retention indices matching. A total of 50 components were identified in the volatile oil including 16 terpene and terpene alcohols, 13 hydrocarbons, 5 alcohols, 6 aldehyde and ketones, 6 acids, 2 esters and 2 miscellaneous components. The major components were n-hexanal (7.3% of total volatile oil), trans-2-hexenal (24.9%), n-hexanol (19.8%), cis-3-hexen-1-ol (5.6%) and trans-2-hexen-1-of (39.4%).