Multiple injuries are injuries in which more than two sites are injured by the same causative factor, and one site is injured at the same time that can endanger the patient’s life, called multiple injuries. Patients with multiple injuries are often combined with shock, or combined with cranio-cerebral injury, so multiple injuries generally refer to more serious injuries, and its ISS score is generally above 17 points. The general principle of treatment for this kind of injury is to save the patient’s life first, and then consider the patient’s fracture and limb function under the condition of ensuring the patient’s life safety. The most direct cause of multiple injuries is often a high-energy injury, and the most common high-energy injury seen in the current environment is a car accident injury. This is why it is now said that car accidents are more fierce than tigers and are the most important factor causing deaths in China today.