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目的：研究减压干燥法在含挥发性成分中药饮片水分测定中的应用。方法采用甲苯法、减压干燥法和烘干法，分别测定丁香、砂仁、当归、川芎的水分，计算各法测定结果，并将减压干燥法和烘干法测定结果与甲苯法测定结果作对比分析。结果甲苯法、减压干燥法都可用于含挥发性成分的中药饮片水分测定，且两者所得结果无显著性差异。结论用减压干燥法测定含挥发性成分的中药饮片，操作简单、结果准确，克服了甲苯法操作繁琐、使用试剂有毒等缺点，值得推广。“,”OBJECTIVE:To study on application of hypobaric drying method which was used to measure the moisture content of the volatile Chinese Herbal Pieces.METHODS:The toluene method, hypobaric drying method and drying method were applied to measure the moisture content of the Clove, Vilous amomum fruit, Angelica and Ligusticum separately, calculated the results and compared the result of decompression drying and drying method for water determination.RESULTS:Toluene method and Hypobaric drying method can be both used to measure the moisture content of the volatile Chinese Herbal Pieces. There is not significance difference between hypobaric drying method and toluene method.CONCLUSIONS:Hypobaric drying method which operate simply, determine accurately,overcome shortcoming of operation complex and having poison is worth popularizing to measure the moisture content of the volatile Chinese Herbal Pieces.