Abstract: The law of desiccation and the influence of effective compositions in Ginkgo biloba leaves were studied in the condition of different microwave powers.Results showed that the microwave power affects the velocity of desiccation to a great extent.About10%of moisture reserved at the end of constant velocity period of dehydration.Over high intensity of microwave radiation results in the decomposition of the main effective composition of flavonoids and terpene lactones partly.Microwave energy based on its special advantages,provides a new method for desiccation of fresh Ginkgo biloba leaves,which can save more energy and also improve the efficiencies of space-time.

Key words: Ginkgo biloba leaves , Microwave desiccation , Flavonoids , Terpene lactones