The full name of Ringer’s solution is compound sodium chloride injection, which is also called Ringer’s solution because it was invented by the British biologist Ringer. Ringer’s solution is made by adding a small amount of potassium chloride and calcium chloride to physiological saline, and the solution contains sodium ions, calcium ions, potassium ions, chloride ions and distilled water. Physiological saline contains only sodium ions, chloride ions and distilled water, so Ringer’s solution is a bit more comprehensive in composition than saline and can replace saline for hydration, electrolytes and adjustment of acid-base balance. Clinically, infusion of Ringer’s solution is used to correct various kinds of dehydration, such as hypertonic dehydration, isotonic dehydration and hypotonic dehydration, as well as complications of diabetes mellitus, i.e. hyperglycemic hyperosmolar state. Because of the relatively high chloride ion content, it can be used for hypochloremic metabolic alkalosis. If a small amount of sodium lactate is added to Ringer’s solution, it makes sodium lactate Ringer’s solution, which is more suitable for dehydrated patients with acidosis or a tendency to acidosis, so it is often used in the operating room.