There are many dropt fruits during the developmental period of citrus, which contain active components. The objective of this study is finding the connection among active components, variety and producing area of dropt citrus fruit. Thirteen samples were colleeted for this study. HPLC was utilized to determine synephrine and hesperidin which were most important active components in dropt fruits of citrus. Results showed that the content of active components varied with citrus variety and area obviously. The range of synephrine content was 0. 47%-1. 83% , and average was 0. 93%. The range of he...