The principles of rehydration for hypovolemic shock are as follows: 1. Fast first, then slow: monitor the patient’s CVP and cardiac function; 2. Crystal first, then colloid: usually supplement saline or balanced fluid, then supplement colloid fluid such as dextrose or hydroxyethyl starch; 3. Salt first, then sugar: supplement saline first, then glucose; 4. Blood component supplementation: supplement whole blood or component transfusion, currently component transfusion is generally chosen; 5. Correction of metabolic acidosis: according to the patient’s blood gas analysis results, correct metabolic acidosis.