The main purpose of preconception checkups is to help men and women who wish to have children to detect abnormalities before pregnancy and take timely measures to avoid problems that may occur during pregnancy, reduce birth defects and ensure pregnancy safety. The preconception examination can objectively reflect the current physical condition of both husband and wife whether they are suitable for childbirth, and what other aspects can be improved, and can also anticipate the defects that the baby may face in the future. The main examination items for men are semen and reproductive system diseases, if the sperm vitality is not enough or oligospermia, can be improved by improving nutrition, quit bad habits to strengthen exercise to improve. However, it is not necessary to test for oligospermia to worry that you have lost your fertility, nor is it necessary to increase sperm count and vitality to normal before you can start preparing for pregnancy. Sperm count and motility are only indicators of the chances of conception. If the test reveals azoospermia or severe oligospermia, further treatment is necessary, otherwise subsequent attempts to prepare for pregnancy are useless. This is the main purpose of preconception testing for men.