Chondrosarcoma is malignant. Chondrosarcoma is a malignant tumor of cartilage, a common primary malignant bone tumor. Chondrosarcoma is prevalent in adults and the elderly, and the most common site of occurrence is the pelvic mouth, followed by the proximal femur, proximal humerus and ribs. Chondrosarcoma is characterized by the production of cartilage by tumor cells, with differentiation of hyaline cartilage, and often mucoid changes, calcification and ossification. Chondrosarcoma has a slow onset and is characterized by pain and swelling. The pain gradually worsens and the mass grows slowly. The growth of the mass to a certain extent may produce compression symptoms. Chondrosarcoma appears on X-ray as a hypodense osteolytic lesion with poorly defined borders and scattered calcified or flocculated ossification. Typically, there may be cloudy changes , the main treatment is surgery, radical resection according to the extent of tumor infiltration. Surgery can also remove metastatic foci. The prognosis of chondrosarcoma is better than that of osteosarcoma. Since chondrosarcoma is a malignant tumor, in order to avoid tumor growth or metastatic spread, delaying the best treatment time. It is recommended that the patient should consult the doctor in time, and under the guidance of orthopedic surgeon, improve the relevant examination and arrange the surgery as early as possible to prolong the life.