Both men and women need to undergo preconception tests before preparing for pregnancy, but the items examined by both parties are not exactly the same. The following items should be checked for the male partner: 1) blood test for blood type, hepatitis B, AIDS, syphilis, etc. 2) semen test for sperm motility and abnormal sperm count to exclude weak sperm and dead sperm; 3) genital ultrasound to exclude abnormal development of reproductive organs; 4) prostate fluid test to exclude inflammation of the reproductive system. The female examination items are as follows: 1. Blood sampling for blood routine, complete set of coagulation, blood type, liver and kidney function, complete set of hepatitis, AIDS, syphilis, eugenics ten items, etc. For patients with menstrual disorders, sex hormone 6 tests should be added. 2. routine leucorrhoea to rule out vaginitis and other gynecological inflammation. 3. gynecological ultrasound to find out whether there are abnormalities in the development of the uterus and both adnexa.