The volatile oil content is one of primary physicochemical properties to classify Zanthoxylum bungeagum Maxim according to the Forestry Standard of PRC—Quality Classify of Prickly Ash(LY/T 1652-2005).The traditional chemical methods to measure the volatile oil content are steam distillation,simultaneous distillation and extraction,and supercritical CO_2 extraction,but they encountered with some problems such as long time,low efficiency.It is difficult to achieve rapid detection.The Near Infrared Spectroscop...