Objective:To study the chemical constituents of the volatile oil from the root of Cinnamomum camphora. Method: The essential oil was obtained by supercritical carbon dioxide fluid extraction(SFE).Extraction conditions were: extracting 2 h at 50 ℃

25 MPa.Separation and determination of the extract were performed by GC-MS

structures were identified with computer retrieval technology

calculated the relative content of the extract with chromatographic peak area normalization method. Result: The extraction efficiency of SFE was 1.7%

54 chemical constituents were separated and identified

39 chemical compositions which matching degree above 90%

accounting for 70.37% of total volatile oil.Main constituents include safrole(29.44%)

elemicin(23.58%)

stigmast-5-en-3-ol(12.43%)

linoleic acid(11.32%)

benzyl benzoate(4.64%)

elaidinic acid(3.37%)

etc. Conclusion: This paper reports the conditions of supercritical carbon dioxide fluid extraction of the root C. camphora and research the composition of volatile oils by GC-MS for the first time.Provides a basis for the use and in-depth study.