The clinical features of 141 patients with osteosrcoma were analysed and conventional radiographs of 92 patients out of 141 patients were reviewed retrospectively in order to assess the distribution of the age sex, locationsand to evaluate the predominant radiographic features. The incidence of tumors occurring in the ex-tremities is 90 percent of total 141 patients. the majortiy of tumors were located in the metaphyses of the long tubular bones. About sixty percent of the patients were in the seconde of life. The increment of long tubular bones. About sixty percent of the patients were in the second decade of life. The increment of the level of serum alkaline phosphatase was observed in 76 (67%) out 114 patients. It is considered that thoractic CT scan might be helpful for the evaluation of metastases was 20 parcent among 30 cases by CT being disclosed higher than by convetional radiographs. Of the 92 patients available for radiographic analysis predominantly osteolytic lesions were disclosed in 17 cases (19%) Preoperative radiographic impression was not the osteosarcoma in 8 out of 17 patients with purely osteolytic osteosarcoma. It was meant that the radiographic diagnosis was difficult in each case of predominantly osteolytic lesions. The patterns of periosteal reaction were variable and there was no evidence of peiosteal reaction in seventeen patients (18%) Both the cortical destruction and the intralesional calcifica-tion were observed in 85 percent of 92 patients with osteosarcoma. Extraskeletal tumor shadow was observe in 79 percent of 92 patients with osteosacoma but either the calcification or ossification was detected in only 55 patients among 73 patients with soft tissue tumor shadows. Only 7 patients had a pathologic fracture all in the femur.