1.Endocrine examination: it can understand the function of ovaries, etc. 2.B ultrasound examination: it can check the size, shape and endometrium of the uterus, etc. 3.Checking of antibodies in blood: including anti-sperm antibodies, anti-endometrial antibodies, etc. 4.Basal body temperature measurement: it can find out whether there is ovulation or not. 5.Tubal lavage or tubal angiography: to find out whether the fallopian tubes are open or not. 6.Other examinations, such as genetic eugenics examination, etc.