The intramedullary interlocking nailing for the fractured tibia has been used in selected cases of fresh diaphyseal fracture, but the indication has been expended considerably with modern technical improvement. The authors analyzed 28 cases of fresh fractures of the tibia, who were treated with unlearned intramedullary interlocking nailing in out hospital between May 1990 to Oct. 1991, average follow-up was 12 months ranged from 8 to 22 months and we obtained the following results. 1. The most common causes of the injury were traffic accident(19 cases). 2. Mostly associated injury was ipsilateral fibular fracture(24 cases). 3. We used unlearned intramedullary interlocking nail in all cases and dynamic and static interlocking were done in 12 cases and 16 cases respectively. 4. The average bony union was demonstrated radiographlcally at 16 weeks. 5. The complications were deep infection(1 case), delayed union(2 cases), angular deformity (4 cases), superficial infection(3 cases), limitation of knee joint ROM(3 cases) and shorte ning of leg length(2 cases). 6. In case of the treated for method of unlearned nailing, it is not difficut to insert the nail, and we obtained good bony union, decresed operation time and bleeding. The authors concluded that unlearned intramedullary interlocking nailing is useful method to treat the tibla fracture.