abstract the essential oils of leaves and fruit pericarps of zanthoxylum zanthoxyloides were analyzed by gc and gc/ms. the leaf oil contained only monoterpene hydrocarbons (98.2%); among them, -pinene (26.5%), myrcene (30.0%) and (e)--ocimene (31.9%) were most predominant. the composition of the fruit oil is more diverse, with 85.5% of monoterpenoids and a fairly large proportion of oxygenated compounds (30.9%), among which linalool (11.3%) and geranial (9.5%) were the most abundant. both the leaf and fruit oils contained fairly large amounts of (e)--ocimene 31.9% and 41.5%, respectively.