Abstract:Analyxis has been carried out by GC-MS on the essential oil from the crude drug Evodia rutaecarpa and its Glycymihiza uralensis processed product,vinegar processed product and salt processed product. The total amount ofessenttial oil decreases in the order of crude drug,vinegar processed,Guralensis processed and saIt processedproducts。The results of GC-MS analysis show that the constituents of the essential oil fron1 the crude drug and its G.uralensis processed product are nlarkedly different,and the coi1tents of these constituents vary sigi1ificantly。