Metastatic bone tumors are the most common malignant bone tumors, accounting for about 75% of malignant bone tumors.CT manifestations are generally osteolytic, osteogenic and mixed types. The metastasis of the same tumor can be manifested as both osteolytic and osteogenic metastasis, and both osteolytic and osteogenic manifestations can be seen on the same lesion, and a few metastatic foci show cystic expansive destruction. Osteolytic metastasis of spine involves adnexa and forms paravertebral soft tissue mass. Osteogenic rib metastasis of prostate cancer, colon cancer, and carcinoid tumor may show expansive sclerosis. Prostate cancer can easily metastasize to the pelvis and nasopharyngeal cancer can easily metastasize to the spine. Bone metastasis of renal cancer is often single, osteolytic and polycystic or foamy, which may be accompanied by bony atrial septum and localized expansive changes. Osteolytic metastases in the skull can sometimes be seen in the center of the osteolytic area with residual normal bone or increased density bone, which is often referred to as target lesion.