Microwave therapy is a branch of radiofrequency therapy that uses energy to produce local heating. Microwave knife is a more common microwave therapy in clinical practice. It is similar in shape to a probe, and the local head end can use microwave heat to produce local heating, which is placed in the central part of the lesion for local heating under the precise guidance of imaging. If the temperature of tumor cells exceeds 60℃, it can cause protein denaturation, produce coagulative necrosis and kill tumor cells, especially for patients with recurrence or patients who have developed resistance to chemotherapy for many times, the local killing effect is better.