1. Physical examination and gynecological examination (with special attention to hirsutism and lactation, gynecological triple examination) Cervicitis does not require treatment. (In case of cervicitis with high secretion, mild episiotomy, moderate to severe with laser or microwave, both treatments do not increase the chances of cervical obstruction because the laser depth is 0.4 cm). If the cervix is not functioning (No. 8 dilation rod passes smoothly), then 12 weeks of gestation, do the annuloplasty. 2. pelvic ultrasound (observation of uterine size and morphology, endometrial condition, ovarian size, number of sinus follicles, follicular development, morphology and blood flow, egg monitoring when using Gn). Uterine fibroids: greater than 4CM or compression of the endometrium? or submucosal fibroids require surgical pretreatment as well as open suture for multiple uterine fibroids. Myometrium or tumor: 3 – 6 months with GnRHa, in order to shrink the uterus or reduce inflammatory factors, and then do IVF is good. If ovarian function is not good, take 4 eggs of good quality in natural cycle first, then use GnRHa. Endometrium: follicle maturity (follicle diameter >18mm or E2 >200pg/ml) and endometrium less than 8mm is thin endometrium and needs to be treated. Endometrial thickening greater than 16mm, if the menstruation is irregular, or the endometrial pattern (after menstruation) is irregular, or if the endometrial nodules have blood vessels, treatment is required; otherwise, no treatment is needed. Endometrial polyp, polyp-like endometrium (no blood vessels in the polyp) less than 2CM in diameter, 4CM in menstrual regulation, or irregular menstruation, need to be treated. Congenital malformation of the uterus: there is no difference in live birth rate in bowed uterus compared to normal women. Hysteroscopic longitudinal hysteroplasty can significantly reduce the embryo loss rate, but not the infertility rate. 3. Cervical cytology (TCT). If necessary, do post-coital test. 4.Basal body temperature (BBT). 5.Check on day 2-4 of menstruation: sex hormones (check sex hormone 5 for normal menstruation and progesterone check when basal body temperature rises 7 days or 7 days before menstruation. Menstrual irregularities check sex hormone six and blood sugar, insulin – pay attention to PCOS, liver and kidney function lipid – pay attention to the use of OC), and also check thyroid function. 6, semen examination (abstinence for 3-5 days, check 2 – 3 times).