Fragility fractures of the pelvis (FFP) are rare in the elderly, but thier incidence is increasing with the aging population. Their mechanism is different from that of the pelvic fracture caused by high energy injury. A new comprehensive classification system can distinguish different degrees of pelvic instability and different types of posterior pelvic ring fracture. The main principles for treating FFP are early activity, pain relief and anti-osteoporosis therapy. An anterior pelvic ring fracture alone is a stable injury and is usually conservatively treated. Pelvic ring injuries involving the posterior pelvic ring are unstable and should be stabilized if the patient′s condition permits. As one of the main goals of treating FFP is functional recovery, restoring pelvic stability is more important than anatomical reduction. Minimally invasive stabilization is superior to open reduction and internal fixation in the treatment of instable posterior and anterior pelvic rings. However, few reports are available about the optimal treatment of FFP, which requires much clinical and biomechanical research.