Abstract: In present work, the volatile constituents of Chinese medicinal herbs, therhizomes of Alpinia officinarum Hance, the peel of the fruit of Orange havebeen analyzed by means of flash distillation/capillary gas chromatography/massspectrometry. The results obatined were similar to that of ordinary methodsof steam distillation-extraction. The conditions of flash distillation have beenstudied. These experimental results proved that such a method was a promis-sing tool for analysis of volatile constituents of natural products. Its main fea-tures were quick performance, simple manipulation and micro quantity of bio-logical sample used.