This paper summarized the experience of ZHANG Zhiyuan， a master of traditional Chinese medicine， in treating gastric diseases with Daizheshi （

Haematitum

）. It is believed that the treatment of gastric diseases should focus on restoring the purification and descent of stomach

qi

， and Daizheshi， as the essential medicine for directing stomach

qi

and counterflow downward， is especially suitable. Commonly， Daizheshi

is used in combination with herbal medicinals Chaihu （

Radix Bupleuri

） and Wuzhuyu （

Fructus Evodiae

） to relieve constraint and direct counterflow downward， with Dahuang （

Radix et Rhizoma Rhei

） and Gualou （

Fructus Trichosanthis

） to disperse phlegm and direct

qi

downward， with Chenxiang （

Lignum Aquilariae Resinatum

） to regulate

qi

and unblock the center， and with Renshen （

Radix et Rhizoma Ginseng

） to open congestion and supplement deficiency. For the syndrome of disharmony between the liver and stomach， the addition of Daizheshi to liver soothing and

qi

regulating medicinals can lower liver

Qi

and calm

Chong Qi

（冲气）， restore the unblock and purge nature of stomach

qi

. For the syndrome of disharmony between the gallbladder and stomach， adding Daizheshi to the medicinals for gallbladder function promoting and phlegm resolving can direct phlegm turbidity downward， and promote gallbladder fire to reach the stomach， permitting the clear

qi

of the gallbladder rising naturally.For spleen and stomach disharmony syndrome， adding Daizheshi to the medicinals for spleen fortifying and stomach warming can calm the counterflow and the center， allowing the deficiency can be replenished. For lung and stomach disharmony， the addition of Daizheshi to medicinals for lung moistening and stomach clearing can directing stomach

qi

downward and harmonizing yin， direct repulsion of hyperactive fire， assist metal to purify

qi

， bank up earth to generate metal， and help with transformation of body fluids.