The traditional treatment of tumor includes surgery, chemotherapy, radiotherapy and Chinese medicine treatment, etc. Interventional tumor therapy is a new treatment method emerging in the past 20 years or so. Interventional therapy is a modern high-tech minimally invasive treatment, under the guidance of medical imaging equipment, a puncture needle is inserted directly into the tumor, or a special catheter, guide wire and other precision instruments are introduced into the human body to diagnose and locally treat the lesions in the body. This high technology has the advantages of minimally invasive (no need to open an incision), low cost, high target and good efficacy, etc. Especially for those tumor patients who cannot be operated, tumor interventional therapy is showing its position in tumor treatment more and more. The principle of interventional therapy for malignant tumors: Interventional therapy for malignant tumors is divided into two categories: vascular interventional therapy and non-vascular interventional therapy. Vascular interventional therapy mainly targets the blood supply artery of tumor, i.e. inserting catheter into the blood supply artery of tumor and injecting anti-cancer drugs into the tumor area to kill cancer directly; or embolizing the blood supply artery of tumor to block the nutrient supply of tumor and reduce the volume of tumor; or performing dual interventional therapy by injecting anti-cancer drugs and embolic agents into the target artery together to block the blood supply and at the same time, the drugs stay in the tumor area to play the role of local chemotherapy to kill tumor tissue. This can block the blood supply and at the same time, the drug stays in the tumor area to kill the tumor tissue. Non-vascular interventional treatment for malignant tumors is to diagnose and treat tumor organs by using various instruments under the guidance of medical imaging equipment such as X-ray, CT and B-ultrasound. It mainly includes two aspects: 1.percutaneous puncture to biopsy inside the tumor for clear diagnosis of tumor or treatment, commonly used in treatment are intratumoral injection, radiofrequency ablation or radioactive particle implantation to achieve the purpose of direct killing of tumor; 2.treatment of lumen narrowing or occlusion caused by tumor through the lumen or puncture technology of human body, i.e. lumen dilation and endoprosthesis, such as esophageal cancer treatment by esophageal stenting. The treatment of esophageal stenting can eliminate the difficulty of eating and restore normal diet. The main indications of interventional therapy for malignant tumors: vascular intervention: lung cancer, liver cancer, liver metastasis cancer, stomach cancer, kidney cancer, colon cancer, pancreatic and duodenal cancer, cervical cancer, ovarian cancer, bladder cancer, limb tumors, etc. Non-vascular interventions: percutaneous biopsy of solid tumors, intra-tumor drug injection, radiofrequency ablation or radioactive particle implantation for lung cancer, liver cancer, kidney cancer, liver metastasis cancer, intraesophageal stent placement for esophageal cancer and biliary tract stent placement for bile duct cancer, as well as stent placement for tracheal cancer and colorectal cancer. The advantages of interventional tumor treatment: No incision is needed, generally only local anesthesia is required instead of general anesthesia, thus reducing the risk. With the guidance of imaging equipment, the positioning is accurate, the damage is small, the recovery is fast, the effect is good, and the complication rate is low; compared with surgery and systemic chemotherapy, the postoperative complications are relatively few and light and do not interfere much with the body, which protects the normal organs to the greatest extent. For malignant tumors that have no curative methods or cannot be operated, interventional therapy can confine the high concentration of drugs to the lesion as much as possible, which has little toxic side effects on the whole body, so that most patients can receive the treatment. Interventional treatment of tumor is a new minimally invasive treatment method, which has a history of less than 30 years in China. Although it is not long, it has been recognized and widely carried out in the medical field soon because of its advantages of small trauma and good curative effect.