Moderate dehydration is a more serious dehydration, in addition to the symptoms of thirst, there are poor skin elasticity, low urine, which can lead to low blood pressure, and in severe cases, the symptoms of shock can occur. When encountering this situation, we should establish intravenous access as soon as possible, replenish fluids as soon as possible, usually within 1-2h, adults should give 1000-2000ml of rehydration fluids to correct dehydration as soon as possible, so that the symptoms of dehydration can be improved as soon as possible, to avoid further aggravation of the symptoms of dehydration, which will cause damage to the whole body. At the same time, we should pay attention to the failure of the disorder, often complicated by metabolic acidosis, according to the situation to give alkaline fluid replenishment, to correct acidosis, reduce the damage of acidosis on the body. In conclusion, moderate dehydration is a more serious manifestation of the need to give timely, as soon as possible, the correct treatment, to reduce further damage to the body, such as the occurrence of shock, the occurrence of severe dehydration, as well as irreversible damage to internal organs.