Low urine chloride means that the urine is low in chloride ions. The human body contains many positive and negative ions, the concentration of which is always changing dynamically, together forming a dynamic balance of ions and acids in the body’s tissue fluids, intra- and extracellular fluids and urine. Chloride ions in the human body also exist in dynamic balance, chloride ions and sodium ions are relatively similar, its intake depends mainly on food intake, excretion mainly through the kidneys, a small amount of also through the skin excretion. The law of excretion follows the less eat less excretion, more eat more excretion, do not eat no excretion. Urine chloride ion is part of the discharge through the kidneys, urine chloride low means that the urine chloride ion content is low, which may be due to its own intake is too small, resulting in less discharge, but also may be more recent exercise, resulting in a large number of excretion through exercise, through the urine excretion of chloride ion relatively reduced.