Endometriosis is a common gynecologic disease of women in which active endometrial cells are implanted in locations other than the endometrium. It occurs mostly in women of childbearing age, does not develop before puberty, and ectopic lesions can gradually atrophy and degenerate after menopause. Prevention of disease is more important than treatment. Here is how to prevent endometriosis. 1, caution should be taken to prevent the uterine cavity contents from overflowing into the abdominal cavity during cesarean delivery and cesarean fetus retrieval. When suturing the uterine incision, do not make the sutures pass through the endometrial layer, and apply saline flushing before suturing the abdominal wall incision to prevent endometrial implantation. 2, timely correction of excessive retroflexion of the uterus and cervical canal stenosis, so that the drainage of menstrual blood is smooth, to avoid stagnation, causing backflow. 3. Avoid performing gynecological surgery as close to menstruation as possible. When it is necessary to do so, the operation should be performed gently and avoid squeezing the uterine body, otherwise the endometrium may be squeezed into the fallopian tube and abdominal cavity. 4. Avoid unnecessary, repetitive or too rough gynecological double consultation near menstruation to avoid squeezing the endometrium into the fallopian tube and causing abdominal implantation. 5. Strictly grasp the operation protocols of tubal patency test (ventilation and fluids) and imaging, and do not perform them just after menstruation or directly during the cycle of scraping to avoid pressing endometrial fragments into the abdominal cavity via the fallopian tubes.