Objective:To analyze the chemical components of the essential oil from different parts of the Ilex hainanensis and provide scientific basis for its quality control. Method: The volatile oil from the leaves

stem of I. hainanensis was obtained by steam distillation and analyzed by gas chromatography-mass spectrometry. The relative content was determined by area normalization. Result: Twenty-four components were identified from the stem

in which accounting for 94.97% of total volatile oil. 33 components were identified from the leaves

in which accounting for 98.48% of total volatile oil. Stems and leaves contain volatile oil composition of compounds:furfural

(2E

4E)-hexadiene

(6Z)-2

6-dimethyl-2

6-octadiene

hexylacetate

dipentene

1-octanol

5-ethenyltetrahydro-.alpha

alpha-5-trimethyl-

cis-2-furanmethanol

terpinolen

inalool

alpha-terpineol

beta-cyclocitral

(Z)-geraniol

geraniol

cyclohexyl n-hexanoate

irisone. Conclusion: The results can be used as the quality standard and provide scientific basis for further development and utilization of I. hainanensis.