There are several ways to replenish electrolytes: 1) Hydration, most of the electrolyte loss in clinical practice is caused by excessive dehydration. 2) Dietary supplementation, meat, vegetables and fruits are rich in electrolyte components. 3) Drug supplementation, oral potassium chloride can effectively replenish potassium ions. Dilute potassium chloride solution in juice and milk and take it after meal can reduce human gastrointestinal reaction. Intravenous potassium supplementation can also play a role in replenishing electrolytes. The speed and volume of potassium ion supplementation should be strictly controlled in the process of intravenous injection to avoid hyperkalemia. 4. Intravenous saline, when an individual’s circulating blood volume is insufficient, use saline to expand the volume and then replenish electrolytes, which can effectively promote the absorption of the body.