Marriage test before marriage can check whether the body is healthy, if there is mental illness, tuberculosis, hepatitis, sexually transmitted diseases, etc. need timely treatment, and wait for the condition to be cured before pregnancy, so as not to aggravate the disease after marriage, or transmit the disease to each other through sexual life, which is conducive to eugenics. The marriage test can determine whether both men and women have hereditary diseases, and if they have hereditary diseases, they need to prevent them in advance, and then carry out the determination of hereditary risks and eugenic guidance, so that they can have a healthy baby. Through the marriage test can find out whether the genital development of both parties is normal, if there is uterine or vaginal dysplasia, male circumcision and other conditions, need to carry out reasonable treatment, so as not to affect the relationship between the couple after marriage, but also lead to family breakup. Marriage test can effectively grasp the time of conception and contraceptive methods, and it is beneficial for both men and women to have a marriage test before marriage.