Interventional therapy is an emerging clinical discipline, which is a minimally invasive treatment using modern high-tech means, different from both “medicine and injection” in internal medicine and “surgery and incision” in surgery. Interventional therapy is the diagnosis and local treatment of lesions in the body with special catheters, guidewires and other precision instruments under the guidance of medical imaging equipment. Interventional therapy uses digital subtraction technology to expand the doctor’s field of vision and extend the doctor’s hands with the help of catheter guidewires. Its incision (puncture point) is small, only the size of a grain of rice, and it can treat many diseases that required surgery or could not be treated in the past or were poorly treated by internal medicine, such as tumors, hemangiomas, various bleeding, etc., without surgery, with the characteristics of small trauma, fast recovery and good results. It is one of the main means and will become one of the most promising clinical medicine specialties in the 21st century. Interventional physicians have been able to intervene with catheters or other instruments into almost all branches of blood vessels and other luminal structures (digestive tract, bile duct, trachea, nasolacrimal duct, etc.) and other specific areas of the body to perform precise treatment with less risk and better efficacy for many diseases.