Hysterolaparoscopy has its most important and irreplaceable efficacy in the management of infertility. In the past 20 years, the safety of hysteroscopic surgery and the rapid advancement of various surgical instruments have made it possible to perform laparoscopic surgery on most patients who used to have to go into the abdomen for infertility correction; and many infertility cases caused by uterine factors can be corrected with the help of hysteroscopic surgery. This has brought a boon to the majority of women with infertility. I. Laparoscopy for infertility Indications and significance: Infertile patients are one of the indications for laparoscopy, and those suspected of possible endometriosis or tubal lesions are particularly suitable. 1. Those with normal HSG. Laparoscopy can detect certain pelvic adhesions or pelvic endometriosis lesions that are not detected by HSG as well as certain ovarian diseases. 2. Those with abnormal HSG. Laparoscopy can understand the exact nature and severity of tubal lesions in order to decide on further treatment options. The timing of surgery is usually performed during the follicular phase (i.e. within 3-7 days after menstruation); if ovulation is needed, the examination should be arranged during the early luteal phase; premenstrual examination is good for visual identification of endometriotic lesions in the pelvic and abdominal cavities. However, luteal phase tubal lavage may cause false positive results of high tubal obstruction due to floating endometrium covering the tubal opening in the uterine cavity, or even endometrium may obstruct the fallopian tubes, so avoid performing tubal lavage during this period. The entire pelvic and abdominal cavity is examined first, including the upper abdomen, to exclude the possibility of pelvic involvement by abdominal organ disease. The uterine lever is placed to move the uterus to fully expose all parts of the pelvic cavity, and then the patient is placed in a low head supine position. The right lower abdomen is made into the second puncture point within the anterior superior iliac spine and the lower 2 transverse fingers into the vascular forceps or suction device to push open the intestinal curvature in the pelvic cavity to observe the whole pelvic cavity, which helps to make a preliminary diagnosis of pelvic diseases. 2.Local system examination Uterus: observe the size and shape of the uterus, the presence of lesions affecting fertility, such as adenomyosis and myoma, and determine the presence of uterine malformations according to the anatomical relationship between the round ligament, fallopian tubes and the ligament inherent to the ovaries. Fallopian tubes: The entire length of the fallopian tubes must be carefully examined. With the help of tubal melanotomy, the tubal twist and luminal obstruction caused by adhesions between the plasma surfaces of the fallopian tubes can be more clearly observed. Then, along the isthmus, the diameter, mobility, adhesions with the ovaries, adhesions on the plasma membrane surface and endometriosis lesions on the plasma membrane surface were examined. The last step is to find out whether the fallopian tubes and ovaries are normal and whether there are adhesions or atresia. Ovaries: morphologic evidence of ovarian activity should be noted, including follicles, corpus luteum, and ovulatory orifice. Ovarian morphologic examination is helpful in the diagnosis of certain endocrine disorders, such as polycystic ovaries and antagonistic ovaries. Endometriosis of the ovary often occurs with adhesions to the posterior lobe of the broad ligament and often requires careful observation to detect. Peritoneal fluid: Aspiration of peritoneal fluid exposes the posterior trap and sacral ligament. The posterior sulcus transmural pool often indicates the presence of an active endometriotic lesion in the pelvis and can be measured for CA125; biochemical and microbiological studies of the peritoneal fluid are valuable in diagnosing pelvic infections and detecting pathogens. Pelvic peritoneum: attention should be paid to the examination of endometriotic lesions and adhesion sites on the pelvic peritoneum. Firstly, visual observation, endoscopy has a magnifying effect and can detect very small endo-peritoneal ectopic lesions.