Objective:To analyze the main chemical components of Cang-ai aromatherapy oils and evaluate the feasibility of the extracting technology.Methods:The volatile oils were extracted from the compound Cang-ai by steam distillation.The stability of extraction was observed and the main chemical components were analyzed by gas chromatography and mass spectrometry(GC-MS)as well.The relative percentages of components were counted by normalization calculate.Results:37 chemical components were detected from the volatile extraction and 13 of them were identified the chemical composition which keep the main effective component of the prescription.The volume of Cang-Ai essential oils had no significant change after heatting at high temperature while its color was obviously change.And,the contents of the chemical composition were reduced certainly by heatting.Conclusion:The extracting technology for Cang-ai aromatherapy oils could keep the main effective components of the prescription.