It is well known that the tibia, with its poor soft tissue coverage as well as precarious blood supply is the one of the most commonly fractured long bone. There has been much controversies concerning over the method of its treatments, much of reasons being attributed to its frequent complication rates. The 47 cases (in 45 patients) with fracture of the shaft of tibia were treated using Ender nailing method at the department of Orthopaedic Surgery, Joong Ahng Gill Hospital in the span of 3 years from March 1986 to Feb. 1989. The results obtained were as follows. 1. The average time of bone union was the 19.3 weeks. ; the 17.9 weeks in closed fracture the 22.5 weeks in open fracture While the rate of bone union was the 89.3% ; the 93.5% in closed fracture the 81.3% in open fracture 2. By the Ellis classification of tibial fractures, average time of bone union was the 15.2 weeks in minor severity, the 22.9 weeks in moderate severity, and the 24.6 weeks in major severity. Therefore the higher the severity, the longer the average time of bone union. 3. The first maneuver in cases of open & comminuted fractures is to install external fixation device, then as the risk of infection was reduced & general conditions also are improved, secondary Ender nailing was performed.