Male preconception medical examination items: I. Semen examination, the most important male preconception examination item is semen examination. The semen examination can be informed of sperm vitality, whether there is little or weak sperm, malformation rate, mortality rate, determine whether there is prostatitis, etc., and make corresponding suggestions and decisions whether to use assisted reproduction technology. Second, the urinary system examination, male genitourinary system problems have a great impact on the health of the next generation, the private parts of the examination is essential, if you think you may have problems with the development of the testicles, you must first ask your parents whether they have suffered from mumps and other diseases. Third, the physical examination, if several years also did not have a physical examination or have not done a marriage examination, hepatitis, syphilis, AIDS and other infectious disease examination is necessary, will also ask the physical examiner and family members in detail about the past health status, as well as whether they have suffered from any disease, how to treat and other circumstances, with special emphasis on asking about mental illness, genetic diseases, etc., and if necessary, also require the examination of chromosomes and blood type, etc.