Intramedullary nailing has become the most popular fixation method in the treatment of the tibial shaft fractures because it affords most rigid fixation of fracture via closed method which makes early rehabilitation possible. Unlearned interlocking nails offer the advantages of loss damage to the intramedullary blood supply, so infectious rate was lower in open fractures compared with reamed nails. We have analyzed 34 cases of 30 patients who performed unlearned interlocking intramedullary nail for open tibial fractures. The results were as follows : 1. The classification of the open fracture was 12 cases Gustilo-Anderson Type I, 20 cases Type II, 2 case Type III. 2. Bony union occured an average of 18 weeks postoperatively. 3. The complication were 4 cases of nonunion, 1 case of deep infection, and 1 case of screw loosening. In conclusion, unlearned intramedullary nailing is a good alternative method for the management of Type I, II open tibial fracture.