Failure to conceive after 1 year of normal sexual life without contraception is called infertility. The prevalence of infertility in China is about 10%, and it is gradually increasing. Infertility is divided into primary and secondary infertility. Primary infertility: never conceived; secondary infertility: once pregnant and then infertile. Causes of infertility: female factor accounts for 40%, male factor accounts for 30-40%; both factors account for 20%, and unknown causes account for 5-10%. Female infertility is mainly due to ovulation disorders and tubal factors, while male infertility is mainly due to sperm production abnormalities and sperm discharge disorders. Since the female side has more examination items and is invasive and risky, while the male examination is simple and non-invasive, the male should be examined first for infertility. Examination methods for infertility 1. Semen routine: Abstain from sex for 3 to 7 days before the examination and take semen by masturbation method. If the result is abnormal, repeat the examination 2 to 3 times at intervals of 1 to 2 weeks. As long as one time is normal, it is considered normal. 2. Tubal lavage (hydrotubation): 3 to 7 days after menstruation, no sexual intercourse after menstruation and no gynecological inflammation, simple method, but it is difficult to make a more correct judgment on the morphology and function of the fallopian tubes. 3. Sonosalpingography (SSG) under ultrasound surveillance: the operation method is similar to that of tubalpingography, and the sonographic changes that occur after the injection of fluid (special ultrasound diagnostic contrast agents are also available) through the fallopian tubes are observed under ultrasound surveillance. 4. Hysterosalpingography (HSG): It provides a more comprehensive understanding of the uterine cavity and the patency of the fallopian tubes and requires an iodine allergy skin test before the procedure. 5. Hysteroscopic tubal intubation and lavage: the tube is intubated and lavaged from the opening of the fallopian tube under direct hysteroscopic view to avoid the illusion of obstruction in the interstitial region due to spasm, tissue debris residue, mild adhesions and scars, and is a reliable method to diagnose and treat interstitial tubal obstruction. 6. Laparoscopy (laparoscopy): comprehensive, accurate and timely determination of the nature and extent of lesions in various organs of the pelvis. Combined with hysteroscopic lavage, it can observe the degree of tubal patency and treat tubal obstruction, which is one of the best means of female infertility examination. 7.Basal Body Temperature (BBT) is simple, easy to perform and basically cost-free, but it is recommended to monitor at least 3 menstrual cycles. 8.Urinary LH measurement: tested during the 10th-16th days of menstruation.