Walking is one of the most natural activities that must be resumed after a lower extremity fracture. During the recovery period after a fracture, both the patient and the doctor are eager to return to the normal state of walking freely before the fracture. However, the lack of muscle strength and imbalance in the affected limb during this period can lead to a number of wrong gait patterns that can affect the life of the patient. The most common wrong gait are the following 4 kinds 1.Hurry gait: when walking, the patient quickly moves the weight from the affected limb to the healthy limb, so that the two legs support time is not equal, the reason is lack of confidence or insufficient support of the affected limb. 2.Tilt gait: walking with stiffness of the affected limb, the hip joint is not fully extended, afraid to let the healthy limb fall in front of the affected limb. 3.Rotary gait: the affected limb is externally rotated when walking, and the body is slightly tilted to the outside. 4, hard knee gait: walking with a stiff knee joint, disappearing the rhythm of one extension and one flexion. The main reasons for the above wrong gait are: 1) stiffness of the joint and muscle contracture which destroy the balance of the muscle group; 2) weakness of the gluteus, quadriceps and gastrocnemius muscles which make the affected limb insufficient support. Therefore, the early functional exercise after fracture should be based on the different characteristics of each fracture, pay attention to strengthen the functional exercise of the gluteus, quadriceps and gastrocnemius muscles, so as to prepare for future walking in advance.