There are some differences between Xiao Cheng Qi Tang and Da Cheng Qi Tang in terms of drug composition, efficacy and indications. Xiao Cheng Qi Tang consists of rhubarb, thick park, hedge hedgehog, with light down the hot knot, eliminating plumping in addition to the effect of fullness, for the treatment of abdominal distension, hot flashes (a burst of fever), the tongue is old and yellow, such as yangming viscera solid light evidence. Dachengqi Tang is composed of rhubarb, Houpu, Citrus aurantium, and manganese nitrate, and has the effect of grimly removing hot lumps and knots. Da Cheng Qi Tang can be used for the treatment of fecal impassability, abdominal pain and refusal to press, yellow and dry tongue and thorns and other symptoms of Yangming viscera solid, as well as spasm caused by internal heat, madness, and so on. In summary, small Chengqi Tang and large Chengqi Tang there is a big difference, the patient should be in the doctor’s evidence under the guidance of reasonable use of medication, do not blindly use their own, so as not to delay the condition.