The "fragrance" of Chinese aromatic medicinals represents its characteristics as well as properties and actions. The term of "use qi nature to play a role"

that is "use fragrance to play a role"

appears late but has a long history of theoretical development. The "fragrance" fully reflects the dispelling

dispersing

unblocking and transforming effects pertain to aromatic medicinals

and can guide the clinical application of aromatic medicinals under the theory of "use qi（fragrance） to play a role" with reference to the properties and actions of four qi and five flavors. Simultaneously

researches to explore the material basis

pharmacological activity and mechanism of "use qi（fragrance） to play a role" have been conducted

which have confirmed the objectiveness of "fragrance" and have enriched its modern theoretical connotation

thereby providing theoretical support for the theory and modern research development of Chinese aromatherapy.