Simple ulnar shaft fracture is rare forearm fractures, if no displacement of the ulnar shaft fractures, mild displacement of not more than 50% or angular deformity less than 10°, can be temporarily fixed plaster, such as sugar-tong splint, and then replace the functional support about 8 weeks. Other cases suggested internal fixation. This ulnar fracture patient with mild displacement, who did not want to take surgery and he choose close reduction for the illness. Fortunately, the result is good.