The essential oil was obtained from the flowers of fresh Chimonathus praecox and dry Chimonathus praecox by simultaneous distillation extraction method and the compounds of essential oils were assayed with combined capillary gas chromatography-mass spectrometry (GC-MS).The result showed that the extracted ratio of fresh Chimonathus praecox and dry Chimonathus praecox essential oil is 0.57% and 0.71%,respectively.A total of 45 and 41 compounds were identified in fresh Chimonathus praecox and dry Chimonathus praecox,respectively, representing 92.623% and 87.078% of the total peak area.These chemical constituents mainly included caryophyllene,longifolene,β-elemene,germacrene,hinesol,α-guaiene.