Objective: To analyze and compare the chemical constituents in the volatile oils from white and purple flowers of Magnolia denudata. Method: The volatile oil was extracted by steam distillation

and analyzed by capillary GC-MS. The constituents were identified based on the standard mass spectral data. The relative content of each composition was calculated by area normalization method. Result: Thirty-seven compounds were detected and twenty-six compounds were identified which were 83.97% of the total essential oil in the white flowers

forty-one components were separated and twenty were identified which were 77.06% of the total essential oil in purple flowers. Conclusion: Through the analysis and comparison of chemical constitutions in the volatile oils of the different color flowers of M. denudata

it has provided the scientific proof for the further developments of the essential oil.