Self-coagulation knife is not microwave therapy, they are very different treatment modalities. 1. Self-coagulation knife: mainly used for the treatment of cervical polyps, need to be in the B ultrasound continuous dynamic observation and guidance of the self-coagulation knife accurately positioned in the site of the polyp, through the high-frequency electromagnetic waves as a source of treatment, and then the use of electromagnetic waves of the thermal effect, so as to make the cervical polyp cells dehydrated and coagulated, so as to achieve the therapeutic effect. The treatment process will not hurt the cervix, and the whole process is painless, and will not affect the normal work and life after the operation. 2. Microwave therapy: Microwave therapy is a kind of treatment mainly through microwave thermal effect, which can promote the dissipation of inflammation and accelerate the role of wound repair. Specific treatment modalities need to communicate with the clinician and cooperate with the doctor during the treatment process to achieve good therapeutic effects.