Professor Liu Jian believes that the pathogenesis of acute myelitis is deficiency of the body and internal injury attacked by external pathogens passing through the meridians and straight to the lesser yin meridian, resulting in disease involving both exterior and interior, the loss of genuine yang, forming a pathological state of "the greater yang meridian and lesser yin meridian infection".Neurogenic bladder is characterized by body deficiency and external pathogen attack, or excessive cold enclosed in the bladder of the greater yang meridian.In addition, kidney yang of the lesser yin meridian is deficient.As a result, the greater yang meridian and lesser yin meridian are infected at the same time, with obstruction of meridian, qi, weakness of bladder, qi, transformation, and dysfunction of water channels, resulting in bladder fluid retention syndrome.Based on the above pathogenesis, Professor Liu often uses some classical formulas such as Ephedra and Aconite and Asarum Decoction, True Warrior Decoction, Five Substances Powder with Poria, etc.and has always achieved good effects.Ephedra and Aconite and Asarum Decoction can warm the meridians and disperse cold, help yang to open the exterior and dispel external pathogens, and connect exterior with interior.True Warrior Decoction can warm kidney yang and restrict cold fluid, tonify yang and consolidate foundation warm the heart and spleen.Five Substances Powder with Poria can activate yang to transform, qi, promote bladder transformation and restore urination and water circulation function.At the same time, he pays attention to distinguish the priorities.If yang is weak and tends to collapse, he often gives first aid to treating interior syndrom.Even if there is evidence on the surface, he never uses sweating.When the cause of the disease is removed and the condition is stable, he uses Dangshen(,Radix Codonopsis,), Huangqi(,Radix Astragali,), Shanyao(,Rhizoma Dioscoreae,), Shanyurou(,Fructus Corni,), Yiyiren(,Semen Coicis,), Wuweizi(,Fructus Schisandrae Chinensis,), etc.to warm the spleen and kidney, replenish qi and consolidate the foundation.