In order to compare the volatile constituents between Houyanling koufuye and its single herb

Chrysanthemi indici flos

and

Clematidis radix et rhizome

the volatile oils of Houyanling koufuye were taken from preparation process

and

Chrysanthemi indici flos

and

Clematidis radix et rhizome

were extracted by water steam distillation. Their structures were analyzed by GC – MS analysis. The relative contents of the components were calculated with peak areas normalization method. The result indicated that there were 24

34 and 27 volatile constituents in essential oil of recipe Houyanling koufuye

Chrysanthemi indici flos

Clematidis radix et rhizoma

respectively. Their contents in volatile oils were determined to be 98.14%

81.95% and 93.64%

respectively. The contents of volatile oils were different between Houyanling koufuye

Chrysanthemi indici flos

and

Chrysanthemi indici flos

.