After a burn injury occurs, especially after a large burn injury, early anti-shock treatment is a more important rescue measure. The amount of rehydration fluid for the specific burn shock period is calculated by the formula related to the burn area, weight and depth of burn of the patient. However, the clinical treatment should be adjusted at any time during the rehydration process, taking into account the patient’s systemic condition. The principle of rehydration is that if a large area is burned, the faster the rehydration, the better. Early rehydration should be fast and then slow, salt first and then sugar, and crystalloid first and then colloid.