Abstract: Abnormal uterine bleeding （AUB） is a common problem. Hysterectomy is the standard treatment for those women with heavy menstrual bleeding who have no response to medical treatment. The endometrial ablatiｏｎ （ＥＡ） ｂｙ the minimal invasive procedure to destroy the endometrium has been used to replace hysterectomy. The NovaSure impedance controlled endometrial ablation, one of those minimal invasive procedures, is a second-generation method of EA for clinical practice in foreign countries over decade. Its principle is based on the power delivery and procedure termination concept, and the well-analyzed physical characteristics of tissue （impedance/resistance） allowing for a controlled depth of tissue destruction in an short time. It is not necessary to pre-treat endometrium. Patient can even be treated when actively bleeding. Other benefits for patients are high safety, effective treatment, short operating time, and automatic operation.

Key words: Hysteroscopes, Hysteroscopy, Uterine hemorrhage, NovaSure impedance controlled system, Endometrial ablation