There has been previous observation of creased growth after injury of the shaft of a long bone in children. This increase has been regarded as either a precise compensatory mechanism by which the discrepancy in length after injury becomes adjusted or as an inevitable and unvarying physiological response to trauma with no such compensatory role. It is well recognized that there is acceleration of the growth rate of the immature femur after a fracture. But there is a few reported about overgrowth of the tibial shaft following fracture in children. We presented the result of the study of 39 children with fractured tibia who were treated in the Department of Orthopaedic Surgery of In Ha General Hospital from 1989. 5 to 1991. 4. The result was follows; 1. The extent of overgrowth after tibial shaft fracture in children was 7.2(± 3.09)mm. 2. The sequence of typical overgrowth after fracture was comminuted fracture, 9.1 (±3.2)mm overgrowth, spiral fracture 7.2 (±0.5)mm, oblique fracture 6.5 (± 3.4)mm, transverse fracture 5.6 (±0.7)mm. 3. Sexual difference of overgrowth shows in male as 6.4 (±3.2)mm, and female as 8.9 (±2.0)mm, and the highest overgrowth rate was in the age of 2 to 4. 4. There was the highest overgrowth within a year after follow up study and we found that the overgrowth continues until 40 months.