The paper summarized professor MAO Dexi′s experience in treating chest Bi heartache from the pathogenesis of fluid retention. Through the analysis of the original meaning of "Yang Wei Yin Xuan" theory

which is the core pathogenesis of chest Bi heartache recorded in Treatise on Cold Damage and Miscellaneous Diseases（伤寒杂病论）

he puts forward that fluid retention is the main manifestation of branch excess patten of chest Bi heartache. From the pathogenesis of fluid retention

the basic treatment of chest Bi heartache should be warming yang and dissolving fluid retention

and if necessary

the methods of moving qi

activating blood

dissipating cold and dispelling water can be added. Ling Gui Zhu Gan Decoction（苓桂术甘汤） is recommended and can be modified based on syndrome differentiation. The specific treatment methods can be divided into different types

including warming yang to dissolve fluid retention method; moving qi to dissolve fluid retention; activating blood and promoting urination; dissipating cold and dispelling water; and expelling water and fluids by purgation.