Tibia is anatomically predisposed to an open fracture because of inadequate covering of soft tissue, and fracture of tibial shaft is more frequently complicated by nonunion than any oter fractures. Although the methods of treatment for nonunion are varied, tibial fractures failed to heal within expected time can constitute a major orthopedic problem. Twenty-six patients of the nonunion of tibia were treated at the Department of Orthopedic Surgery, Ewha Womans University Hospital from January 1983 to December 1990, and were analysed. The results were as follows ; 1. Of twenty-six cases, 21 cases were injured by traffic accident. 2. Most common fracture site & type were middle 1/3 and comminuted fracture. 3. Among fifteen cases of open fracture, seven were Gustilo Type I injury 4. Seventeen cases were associated with injury of other part of the body. 5. Hypertrophic type nonunion were treated intramedullary nailing with fibular osteotomy and then early weight bearing, and these union and satisfactory results were obtained. 6. Atrophlc type nonunion were treated plate and screws with bone graft, and also satisfactory results were obtained.