One hundred and two patients with fracture of the tibial shaft were treated conservatively at the Department of Orthopaedic Surgery, National Medical Center from 1977 to 1982. In this article, we have analyzed early and late influencing factors upon healing process of the tibial shaft fractures treated with conservative methods. Early factors: Age, fracture type, initial displacement, comminution, open fracture, ipsilateral fibular fracture and associated injuries. Late factors: Interval between accident & final manipulation, distraction of fracture site after skeletal traction, and condition of final apposition. Also, we had the result that the mean healing time of tibial shaft fx. was 17.9 weeks by conservative treatment.