Introduction CHAPTER Ⅰ The Study on the Chemical Constituent of the Fruits of Juglans Mandshurica 1.1 Extraction and Isolation 1.2 Structure Elucidation 1.3 Bioassy CHAPTER Ⅱ The Study on the Chemical Constituent of Tinospora sinensis 2.1 Extraction and Isolation 2.2 Structare elucidation CHAPTER Ⅲ The Study on the Chemical Constituent of Leaves of MaUotus furetianus 3.1 Extraction and Isolation 3.2 Structure elucidation CHAPTER Ⅳ The Study on the Chemical Constituent of the Seeds of Cucurbita moschata 4.1 Extraction and Isolation 4.2 Structure Elucidations Conclusion Experimental Section References