The balance of water, electrolyte and acid-base of the human cells is of crucial importance to maintaining normal metabolism and physiological functions of various organs as well as human life. Due to various reasons , such as illness, trauma, infection, physical and chemical factors and improper treatment, the deviation of the balance, when it exceeds the body's compensatory ability or the body lacks regulating ability, will cause the disorders of water, electrolyte and acid-base. It should also be treated for their primary diseases in addition to appropriate medication adjustments in this chapter once the disorders occur. This kind of medicine is now classified as electrolyte balance regulating medicine, acid-base balance regulating medicine, compound electrolyte infusion and dialysate, glucose and the others.