Ablation therapy is a minimally invasive tumor treatment modality that has developed rapidly in recent years. The treatment is guided by using imaging equipment, such as CT, ultrasound, and so on. Then one or more thin puncture needles are used to penetrate into the tumor and inject chemicals into the tumor or heat or freeze to kill the tumor cells. This can cause necrosis and absorption of tumor tissues to eliminate tumor or reduce tumor load, which is the most important method of local minimally invasive interventional treatment for tumor. According to the different treatment principles, it can be divided into chemical ablation and physical ablation. 1. Chemical ablation: chemical substances such as anhydrous alcohol and hydrochloric acid are injected into the tumor to cause chemical denaturation of tumor tissues, thus causing tumor necrosis. Physical ablation is the use of freezing or heating and other physical methods on the local tumor to cause the destruction and disintegration of tumor cells. Physical ablation: The main treatment methods are radiofrequency ablation, microwave ablation, laser ablation and other thermal ablation methods. That is to cause tumor necrosis by local heating of tumor to about 100℃, while cryoablation is to freeze tumor tissue to about -170℃ to freeze the tumor.