In this paper, the effects of different processing methods on the contents of main chemical constituents and antioxidation of Eucommia Ulmoides Oliv leaves were studied. The optimum conditions extracting antioxidants from E. ulmoides leaves by supersonic wave were determined. As well as the contents of main chemical constituents in E. ulmoides leaves and E. ulmoides cortex from different models in different seasons were studied in order to provide scientific basis for the further processing of E. ulmoides. ...