Computed tomography was used in the evaluation of intra-articular fractures of the calcaneus to develop and reasonable treatment program and predict prognosis. Seventeen fractures of the calcaneus in the sixteen patients were shown to involve the posterior facet and classified by the images of coronal CT scan; Type I(non-displaced), Type II(displaced) and Type III(comminuted). There were one Type I, ten Type II, and six type III fractures. All of which were treated with open reduction and internal fixation, with or without bone graft. The length of follow-up period ranged from thirteen to fourty-five months(mean : 24 months). The results were graded by a predetermined point system. The one type I had an excellent result. Of the ten type 2 fractures ; three had excellent result, four good result, two fair result, and one poor result. Ofthe six type 3 fracture, one had good result, three fair result, two poor result. On the basis a our study, we believed that open reduction and internal fixation was a good method of treatment for the displaced or mildly comminuted intraarticular fracture of the calcaneus