The difference between hysteroscopic clearance and painless clearance is mainly in two aspects: First, hysteroscopic clearance is to use a mirror to indicate the main part of the lesion under hysteroscopic examination and then to do the operation of clearance. Second, painful and painless. Painless means that the operation is performed under anesthesia, and the patient has no pain, and can do the hysteroscopic clearing without pain, or can do the clearing directly under painless anesthesia, i.e. normal clearing operation without hysteroscopy, characterized by not being able to suggest the obvious lesion site, and just doing the clearing under painless condition.