Metastatic bone tumors is a primary malignant tumor which is primary outside the bone. It belongs to a secondary malignant tumor spreading to the skeletal system through blood and lymphatic system. It is mostly discovered in elderly patients over the age of 40. The most metastatic tumors include prostate cancer, lung cancer, breast cancer, thyroid cancer, kidney cancer, etc. Presence or absence of bone metastatic tumor has very important sense to tumor staging, formulation of the best treatment plan, etc. Therefore, early detection as well as timely and effective treatment can obviously improve the patient's life quality of life, and increase the survival rate. Imaging examination is the most commonly used method for clinical diagnosis of bone metastatic tumor at present. The examination methods mainly include X-ray, CT, magnetic resonance imaging (MRI), radionuclide imaging, etc. Any malignant tumor may be transferred to the skeleton system, and the adult metastatic bone tumor incidence is about 40 times of primary malignant bone tumor [1, 2]. Morphological diagnosis, including 'four fixed aspects' (accurate positioning, being qualitative, being quantitative locally and in diffusion scope as well as staging), provides comprehensive and valuable information about lesion in early stage. It is anatomy imaging foundation necessary for clinical operation and modern radiotherapy or chemotherapy, which is also related to acquisition of more effective treatment results and prognosis closely.