A solid or liquid substance is selectively injected into the tumor blood supply artery and tumor blood vessels through a catheter to block the tumor blood supply and inhibit tumor growth. For tumors that cannot be removed surgically, this therapy can shrink the tumor and reduce pain and other complications to achieve the purpose of delaying life and improving survival quality. Types of embolic agents: (1) solid embolic agents: mainly gelatin sponge, polyvinyl alcohol (PVA), etc. (2) Liquid embolic agents: iodine oil, anhydrous alcohol, Chinese medicine preparation, etc. Among them, iodine oil disappears after several days in normal tissues after arterial injection, but stays in tumor tissues for a long time, which can reach several months or more than one year. Iodine oil and anti-cancer drugs are made into emulsion or suspension for embolization of tumor, which is called Transcatheter arterial chemoembolization (TACE), and iodine oil is used as a carrier of anti-cancer drugs, so that the drugs can stay in the tumor for a long time at a high concentration and release slowly, which increases the anti-cancer effect of the drugs; at the same time, it blocks the blood supply to the tumor. TACE has become the main mode of interventional treatment for tumor with rich blood supply. Zhang Xuejun, Department of Interventional Radiology, People’s Hospital of Inner Mongolia Autonomous Region