Interventional therapy is a mini-invasive therapy that under the guidance of medical image equipment. It mainly has two categories: vascular interventional therapy and non-vascular interventional therapy or diagnosis. With a 1-2 millimeter cut, paracentesis could be performed with the lead of medical image equipment like CT. Then the special tube, transend or other sophisticated apparatus are introduced into human body for diagnosing the conditions or draw some tissues for topical therapy at the same time or any other time. Interventional therapy is applied vastly in tumor diagnosis and treatments because of its advantages like no operation, small wounds, fast recovery and good effect.