The most dangerous complications of pelvic fracture are specifically as follows: 1. Immediate traumatic hemorrhagic shock at the time of trauma, traumatic hemorrhagic shock will lead the patient to enter the death triangle of traumatic hemorrhagic shock in the case of blood loss, i.e. coagulation dysfunction, hypothermia and acidosis; 2. Pelvic fracture often has delayed injury, i.e. secondary injury. At the time of trauma, the patient may be in hemorrhagic shock, and if improperly moved and transferred, secondary injury often occurs, which may cause a large amount of posterior peritoneal hematoma, and this hematoma may increase bleeding and may be life-threatening at the second, or even third, subsequent injury; 3. The pelvic fracture severed end may damage the adjacent organs, usually common is rectal and bladder and urethral injury. These injuries may bring about severe infection and even more bleeding throughout the surgically traumatized area. These three conditions, in order, are life-threatening at the time of injury, after the injury, and from complications, and are all very delicate and require specialized medical staff to manage. It is recommended that patients who encounter these pelvic fractures in one trauma should seek professional medical team for handling and treatment in time.