Abstract: The contents of 6 secondary metabolites, such as flavonoid, tannin, alkaloid, saponin, lignin and chlorogenic acid, in the different organs of Heptacodium miconioides were determined and analyzed. The results showed that there were certain differences among the contents of 6 secondary metabolites in the different organs. The secondary metabolites total content in the oldest root was the highest and the major component was lignin. The content of flavonoid, sponin and alkaloid in the leaves was the highest (24.13, 5.51, 31.08 g·kg^-1, respectively). The content of chlorogenic acid in flowers and leaves was higher than other organs (38.74, 37.13 g·kg^-1, respectively). The content of tannin in the young root was the highest (9.33 g·kg^-1). The content of lignin in the old root was the highest (120.43 g·kg^-1). The contents of 6 secondary metabolites in the different organs of H. miconioides were definitely correlated with their synthesis pathway,transport direction and effect part.

Key words: Heptacodium miconioides, secondary metabolites, content, organ