Microwave therapy for tumor is a treatment method that uses the thermal effect of microwave to form a high-temperature environment for the tumor and selectively cause irreversible cell necrosis. Microwave therapy for tumor requires the insertion of microwave needles into tumor tissues under ultrasound guidance or laparoscopy and direct vision, which in turn produces an ellipsoidal coagulation zone, thus leading to irreversible necrosis of tumor cells, and thus achieving the therapeutic purpose. It is commonly used in the treatment of liver cancer, intracavernous tumors and body surface elevated tumors. Tumor microwave therapy has the advantages of simple operation, repeatable, etc. It is an interventional minimally invasive procedure, which is less damaging to the patients. For patients with smaller tumors, microwave ablation can kill all the tumor cells, which may lead to a cure.