The time to remove the cast for a minor bone fracture needs to be determined by the specific fracture site and age. If the immobilization time is too long, it is easy to stiffen the joint, and the immobilization time is not long enough, it may cause misalignment of the fracture. If it is a minor fracture of a limb in a child, the cast can be removed after 4 weeks of immobilization. If it is a minor fracture of the extremity of an adult, the cast should be removed after 4-6 weeks of immobilization and braking across the joint, and should not be immobilized across the joint for more than 6 weeks, otherwise it will easily lead to joint stiffness. If the cast immobilization and braking does not cross the joint, the cast can be removed after 6-8 weeks of immobilization. Although the cast can be removed after a certain period of immobilization for a minor fracture, the fracture has not completely healed, so the fracture needs to continue to be rested and rested, and the local area should not be blindly exerted. Complete healing requires more than 3 months after the injury, and regular follow-up X-rays of the fracture site to determine.