This paper summarized professor ZHANG Boli's experience in treating stubborn

bi

（痹） with the herbal pair of Ruxiang （

Olibanum

）- Moyao （

Myrrha

）. The basic pathogenesis of stubborn

bi

is channel and collateral stasis and obstruction. Ruxiang and Moyao are thus used in mutual reinforcement to rectify

qi

and diffuse

bi

， activate blood and relieve pain， thereby removing static and obstructed

qi

and blood， unblocking the obstructed channels and colla-terals， which is especially suitable for stubborn

bi

caused by channel and collateral obstruction. In clinical practice， the herbal pair of Ruxiang-Moyao

is used together with

qi

-moving and blood-activating medicinals to treat chest

bi

by expelling stasis and diffusing stagnation， dissipating cold and unblocking vessels. To treat long-term wither and weakness in late stage of stroke， the medicinals of boosting

qi

and invigorating blood， unblocking channels and venting collaterals can be added to the herbal pair so as to soothe and drain vessels and collaterals， harmonize and regulate

qi

and blood.

Simiao Yongan Decoction

（四妙勇安汤） can be integrated in the treatment of vessel

bi

by moving

qi

and dissolving stasis， and for the long-term stubborn vessel

bi

， integrated internal and external treatment is suggested by external use of Ruxiang-Moyao to vent

bi

with aromatics. Moreover， it is emphasized to use the herbal pair of Ruxiang-Moyao

in accordance with indications and cautions.