Abstract: The main distribution of Leontopiodium haplophylloides Hand-Mass is found grown in the west China or Qinghai, Sichuan, Gansu provinces. The essential oil and extractum are extracted from its stem, leaf and flower by steam distillation and solvent extraction. According to the analysis, it contains 0.1003% essential oil and 0.74% extraction in average. The chemical constituents of this essential oil have been identified by GS-MS. 22 kinds of components were separated. The main compounds are guaiacol, 3,7,11-trmethyl-1-ol-doclecatrien -2,6,10, vanillyl formate, diacidbenzene (2-ethylmethoxyl) diester, hexadecane acid, gurcumene, tricyc1oheptene, linalool, phenylethyl benzcate , ethylbenzyl carbinol, geranial, vanilly1alcohol etc. The aroma type of the plant has also been identified, as Qinglinghua aroma which is delicate, sweet and rare. It is very valuable in daily chemical and food industry. The plant will be a new raw materials source of nature perfume.

Key words: Leontopiodium haplophylloides, chemical constituents of the essential oil, Qinglinghua aroma type