Inclusion Criteria:  Confirmed diagnosis of spinal metastasis (previously confirmed diagnosis of lung cancer, liver cancer, prostate cancer, breast cancer, kidney cancer, digestive tract cancer, imaging indicated the presence of metastatic lesions in the spine) Patients with symptoms of spinal instability or nerve compression (SINS score of spinal instability ≥7, spinal nerve compression according to spinal cord injury Classification, grade A-D) Metastases are located in the thoracic and/or lumbar vertebrae The patient's expected survival was longer than 6 months The subjects or their legal representatives were able to understand the study purpose, demonstrate adequate compliance with the study protocol, and sign informed consent  Exclusion Criteria:  He had previously operated on the same site Spontaneous multiple compression fractures of the spine; There is malformed osteitis (Paget's bone disease), osteomalacia, or other metabolic bone disease; here were developmental vertebral malformations or vertebral body and pedicle dysplasia in the spinal segment to be treated by surgery Presence of heart, lung, liver or kidney failure or other serious diseases (such as osteomyelitis, systemic infection, severe hemorrhagic disease, active disseminated intravascular coagulation, serious cardiovascular disease or myocardial infarction within 6 months prior to enrollment, cerebral infarction within 6 months prior to enrollment, severe psychiatric history) Pregnant or lactating women Participated in clinical trials of other drugs or medical devices within 3 months prior to enrollment