This paper summarized professor CHENG Choufu′s experience in treating chest bi（痹） based on shaoyang（少阳） theory. Chest bi is considered to be paroxysmal and has similar pathological characteristics with shaoyang diseases. Conversely

shaoyang channels

collaterals and zang-fu organs（脏腑） are all closely related to the heart. The abnormal performance of shaoyang pivot leads to the formulation of phlegm and stasis

which are the pathological factors of chest bi. Therefore

shaoyang theory can followed when treating chest bi. Xiaochaihu Decoction（小柴胡汤） is recommended as the basic formula in clinical practice

with the function of harmonizing shaoyang

soothing the liver and rectifying qi to move qi stagnation; when phlegm heat is accompanied

Chaihu Xianxiong Decoction（柴胡陷胸汤） is commonly used to disperse the phlegm heat through clearing heat and dissolving phlegm

loosening the chest and dissipating masses; when blood stasis is accompanied

Chaihu Danshen Decoction（柴胡丹参饮） is used to invigorate blood and dissolve stasis

move qi and relieve pain; when there are both phlegm heat and blood stasis

modified Chaixian Danshen Decoction（柴陷丹参饮） or Chaihu Longgu Muli Decoction（柴胡加龙骨牡蛎汤） are recommended.