It is relatively common for patients to become dehydrated due to nausea, vomiting, profuse sweating, or loss of blood volume, and the remedies for body dehydration are as follows:1. If the patient is lucid you can encourage the patient to drink more warm water, and if necessary, you can also encourage the patient to drink sugar and saline to replenish the loss of electrolytes as well as replenish the loss of sugar, and to strengthen the nutritional support.2. Patients who are not able to drink actively can take an intravenous rehydration, supplementing 0.9% sodium chloride solution or 5% dextrose. On the one hand, it can give energy support, and on the other hand, it can also correct the electrolyte disorder of the patient.3. If the patient can not drink actively and the heart function is poor, and can not replenish a large amount of fluids, he can insert a gastric tube, and beat water from the nasal feeding tube, and then absorb it through the gastrointestinal tract, which is a safer and quicker way, and it is not too heavy for the burden of the heart.