Infertility is a condition in which a couple is unable to conceive after one year without contraception. There are many causes of infertility, so the examination and treatment can not be completed in one visit, but special examinations need to be done according to the days of menstrual cycle. Medical history and physical examination: When you come to the hospital for examination, it is best to come with your husband to be questioned and examined. The examination of women such as whether they have appendicitis or peritonitis in the past, whether they have had surgery, whether their menstruation is regular, how often they have sex, and whether there are any obstacles to sexual intercourse. Another gynecological examination can reveal whether there is gynecological inflammation, uterine fibroids, malformations or ovarian cysts, etc. 2.Semen examination: Before semen examination, men need to abstain from sex for 5-7 days, then ejaculate semen into a wide mouth bottle by masturbation and send it to the laboratory for examination within half an hour to one hour, the items are semen quantity, spermatozoa number, activity rate and malformation rate to see the fertility of Mr. 3.Basal body temperature: In a normal menstrual cycle, each time there is a low temperature period and a high temperature period, which is called “biphasic”. In addition, basal body temperature can also tell whether the luteal function is good enough. Therefore, basal body temperature is very valuable for the diagnosis of infertility, so you should bring the female partner’s temperature chart to each visit. 4. Endocrine blood test: The hormone concentration in the blood is measured on the 2nd-3rd day of the menstrual cycle to detect ovarian function. 5. Immunological infertility tests: anti-sperm antibodies, closed antibodies, anti-endometrial antibodies, etc. 6. Iodine-oil examination of the fallopian tubes: blocked fallopian tubes or pelvic adhesions account for a large part of female infertility. This test is usually done within 3-7 days after menstruation, which can reveal not only the location of obstruction but also whether the uterine cavity is sticky, deformed or compressed by tumors. 7.Laparoscopy: When the above clinical examinations fail to find the cause, or when endometriosis is suspected, it is necessary to rely on laparoscopy, which can observe the entire pelvic cavity including the uterus, fallopian tubes, ovaries and peritoneum, and can even instill blue potion through the cervix to find out whether the fallopian tubes are open or not.