Ultrasound technology has an important role in the diagnosis and treatment of tumors. Currently, through ultrasound guidance, we can perform the following: i. Drainage: small amount of plasma cavity fluid (pericardial, thoracic and abdominal cavity) puncture and placement, renal puncture and fistula, bile drainage, abscess puncture and drainage. Second, puncture biopsy: superficial lymph nodes, liver occupancy, lung occupancy close to the chest wall, mediastinal occupancy, renal occupancy, thyroid occupancy, abdominopelvic mass, etc. Ablation therapy: ablation therapy for tumors in liver, abdominopelvic cavity and chest wall (radiofrequency ablation and chemical ablation, such as intratumoral anhydrous alcohol injection). IV. Catheterization: percutaneous hepatic penetration portal vein catheter drug box system placement, deep vein chemotherapy pump implantation. V. Inter-tissue brachytherapy with radioactive particles: for the treatment of superficial lymph node metastases, liver tumors, lung tumors close to the chest wall, mediastinal tumors, kidney tumors, thyroid tumors, and abdominopelvic tumors.