Choosing radiofrequency ablation treatment for liver tumors is still relatively safe, with low systemic impact and mild trauma response. The complications after treatment are generally below 5-6%. The relatively common complications include the following: 1. peritoneal or diaphragmatic thermal injury caused by radiofrequency causing pain at the treatment site 2. hemorrhage or hematoma under the liver perforation site 3. liver abscess at the treatment site 4. acute cholecystitis if the treatment site is close to the gallbladder 5. injury to organs around the liver such as colon perforation 6. tumor implantation and metastasis along the perforation needle tract 1-2 days are needed after treatment. Medical observation is needed for 1-2 days after treatment to prevent various complications and to provide timely treatment after complications are found.