Nowadays, we all advocate eugenics, so before marriage and pregnancy need to do some relevant checks, usually pregnancy checks, not only need to cooperate with the woman, for men also need to do a comprehensive pre-pregnancy check. Generally, there are several aspects to the male examination, such as semen routine examination, prostate examination, blood routine, liver and kidney function, and even sperm antibody screening, through the semen examination can help to understand the pre-pregnancy male semen volume, survival rate and sperm morphology, as well as semen pH is normal, and even some hospitals will be mycoplasma screening, to prevent viral infections, resulting in a decline in the quality of the sperm. A good pre-pregnancy check will prevent abnormalities in the development of the embryo, the general pre-pregnancy of men and women to do a good job of the relevant examination and choose the time to prepare for pregnancy, try to achieve eugenics, eugenics, to reduce the fetus after pregnancy, such as deformities and anomalies occur. In addition, men should quit smoking and drinking before pregnancy to ensure that the quality and shape of sperm reaches the optimal degree.